Underground high pressure hydraulic pulse generator

The utility model discloses an underground high pressure hydraulic pulse generator, comprising a converting connector, an upper positioning ring for sliding valve, a sliding valve, a sliding valve spring, a lower positioning ring for sliding valve, a sliding valve cylinder sleeve, a piston cylinder sleeve, a piston, a piston spring, a spring frame, a pressure increasing cylinder, a shell and a high-pressure spraying tube. The pressure increasing cylinder, the spring frame, the piston spring, the piston cylinder sleeve, the piston, the sliding valve cylinder sleeve, the lower positioning ring for sliding valve, the sliding valve spring, the sliding valve and the upper positioning ring for sliding valve are orderly arranged in the inner part of the shell from bottom to top. The upper end of the shell is connected with the converting connector, and the lower end of the shell is connected with a drill head. The outlet of the lower end of the pressure increasing cylinder is connected with the high-pressure spraying tube, and the high-pressure spraying tube is inserted into the inner part of the drill head and directly inserted to the well bottom. The sliding valve and the piston are moved to and fro under the combined action of the surge pressure, the inertial force and the elastic force of the spring. A periodic pressure increasing pulse and a negative pressure pulse are formed at the well bottom, the 'chip hold down effect' of the detritus is reduced, the clean-up effect of the well bottom is strengthened, and the efficiencies of the jet rock-breaking drilling and the auxiliary rock-breaking drilling are improved.