The authenticity of Baidiwang beer can be distinguished by the following methods:

1. Trademark: The trademark of genuine Baidiwang beer has the Baidiwang logo.

2. Bottle cap: The bottle cap of genuine Baidiwang beer has an anti-counterfeiting mark.

3. Bottom of the bottle: The bottom of the bottle of real Baiduwang beer has edges and corners.

It is recommended that when purchasing Baidiwang beer, you purchase it through official channels to avoid purchasing counterfeit products.