Double-speed PDC drill bit based on turbine power generation type motor driving

The invention discloses a double-speed PDC drill bit based on turbine power generation type motor driving. The double-speed PDC drill bit mainly comprises an upper joint, a turbine shaft upper positioning block, a large steel ball, turbine blades, a generator, a large spring, an extension large drill bit, a motor, a motor rotating shaft joint, a central small drill bit and the like; an assembly sequence is that the motor rotating shaft joint and a flow guide joint are assembled, and then are assembled along with the motor into the extension large drill bit with a Y-shaped sealing ring, and thecentral small drill bit and the large spring are assembled; small steel balls are mounted on a turbine shaft lower positioning block and then assembled with the turbine shaft, the generator and turbine blades are assembled and mounted in a turbine shell together; and the large steel balls, the turbine shaft upper positioning block and the upper joint are assembled in sequence; and the two parts are assembled together to