The influence of tariff collection on international trade is shown in the following four aspects: (1) Tariff collection has a great influence on the development of world trade. When major countries in the world generally raise tariffs and strengthen non-tariff barriers, not only will the number of import and export commodities in these countries decrease, but also the number of imported commodities will further decrease due to mutual influence and interaction, thus affecting the development of international trade. Other things being equal, the increase or decrease of tariff rates or the strengthening of non-tariff barriers in major countries in the world is inversely proportional to the development speed of international trade. (2) Imposing tariffs affects the structure and geographical direction of import and export. Tariff barriers and non-tariff barriers affect the changes of international trade commodity structure and geographical direction to some extent. In developed capitalist countries, the decline of import tariffs on manufactured goods exceeds that of agricultural products, and the impact of non-tariff barriers on manufactured goods is less than that of agricultural products; The tariff reduction between developed capitalist countries exceeds that of developing countries and socialist countries; The foreign trade of developing countries and socialist countries is more affected by non-tariff barriers in developed countries than in developed capitalist countries themselves. This difference is an important reason why the trade of manufactured goods grew faster than that of agricultural products after the war, and the trade growth between developed capitalist countries exceeded that between developing countries and socialist countries. (3) It affects the prices of import and export commodities, and the production and sales (1) lead to the rise of commodity prices, which makes consumers suffer losses. After the imposition of tariffs, the prices of imported goods rose; Non-tariff measures restrict imports, which reduces the quantity of imported goods, and also causes the price of imported goods to rise when other conditions remain unchanged. The price of the same product in China will also increase. Increase consumer spending. (2) Increase the national fiscal revenue. Both fiscal tariffs and protective tariffs have the function of increasing national fiscal revenue. Although the proportion of tariff revenue in national fiscal revenue has been greatly reduced, it is still one of the important sources of fiscal revenue in developing countries. (3) Protecting domestic industries and markets. After imposing tariffs on imported goods, it increases the cost of imported goods, weakens their competitiveness with similar domestic goods, and affects the sales of imported goods, thus playing a role in protecting domestic industries and markets. The increase in the price of imported goods will drive up the price of similar products in China and bring more profits to related manufacturers. For exporting countries, the import tax levied by importing countries will affect the reduction of export commodities, export quantity and price, and make exporting countries suffer losses. High tax rate → high import and export commodity prices → low import quantity → low tax rate for promoting domestic production → low import and export commodity prices → large import quantity → reducing domestic market production (4) affecting a country's balance of payments and trade deficit. If a country has a serious trade surplus and balance of payments deficit, it can temporarily curb imports, narrow the trade deficit and improve the balance of payments by widely adopting import restrictions such as raising import tariffs.