Deep hole geological prospecting drilling machine

The utility model relates to a deep hole geological prospecting drilling machine. The deep hole geological prospecting drilling machine comprises a frequency conversion permanent magnet synchronous motor, a bearing housing, a hydraulic fluid chamber, a gyrator, a rotary motor, a water faucet used for slurry circulation, a back-up wrench used for moving or fixing a drill rod and a lifting ring. A center shaft of the frequency conversion permanent magnet synchronous motor is hollow; the motor hollow shaft is communicated with the water faucet, a hollow shaft of the bearing housing stretches downwards out of the bearing housing. A bearing is arranged on the outer side of a bearing housing hollow shaft collar and is connected with the bearing housing. The gyrator is sleeved on the bearing which stretches out of the bearing housing. The hollow shaft of the drill rod is communicated with the hollow shaft of the bearing housing. One end of the lifting ring is connected with two sides of the bearing housing. Due to the fact that the drill rod is directly driven to rotate by the frequency conversion permanent magnet synchronous motor, and therefore, a gear reducer is omitted, maintenance costs for daily use are reduced, the transmission efficiency is improved, energy utilization rate is improved, energy consumption and carbon emissions are reduced and the environmental pollution is reduced.