Also known as rotary drilling rig. It is a tool for road traffic and high-rise building construction. Rotary drilling rig is a kind of comprehensive drilling rig. Under the condition of mud wall protection, it can be dug dry with short spiral bit or wet with rotary bit. Rotary excavators can cooperate with impact hammers to drill hard strata and then dig holes. If the drilling tool with enlarged head is matched, reaming operation can be carried out at the bottom of the hole. Rotary drilling rig adopts multi-layer telescopic drill pipe, which has the advantages of less auxiliary drilling time, low labor intensity, no need for mud circulation slag discharge, cost saving and no pollution, and is especially suitable for foundation construction of urban construction.