The use of pneumatic water well drilling rigs in rocks and complex layers has the following advantages: (1) The wind speed of slag discharge is high, the bottom of the hole is clean, and there is no secondary breakage; due to the absence of liquid column pressure, the breakage at the bottom of the hole is improved in the absence of groundwater Conditions; (2) The drilling method of pneumatic water well drilling rig is to impact the bottom of the hole with high frequency, which reduces the influence of hole inclination on rock or inclined strata, thereby improving the verticality of drilling, and at the same time, reducing the impact of rock on the wall of the hole. Collapse; (3) Compared with rotary water well drilling rig drilling, drilling pressure and torque required for pneumatic water well drilling rigs are much smaller. This can reduce the quality and capacity of drilling rig equipment, and create favorable conditions for large-diameter hard rock drilling; (4) Pneumatic water well drilling rigs have good adaptability and can be used in various complex rock formations (including aquifers). (5) Simple structure, easy to use and maintain.