Full-casing rotary drilling rig is a new type of drilling rig, which integrates full hydraulic power, transmission and electro-hydraulic control. Driving casing 360 degree rotary drilling, the drilling technology with good mechanical performance, deep hole formation, large pile diameter, economy, environmental protection and high efficiency is suitable for all kinds of complex geological formations. Verticality of drilling hole is easy to master, vertical precision is high, and pile quality is good.