The invention relates to a hydraulic oscillator for drilling, in particular to a switch-type hydraulic oscillator for drilling. The oscillator comprises a shell, a switch cylinder, a switching cylinder, a spring pressure cylinder and an oscillator part; the switch cylinder is installed inside the shell; the switching cylinder is arranged at one end of the switch cylinder, one end of the switching cylinder is movably installed in the switch cylinder in an inserted mode, and a switching pin is arranged on the switch cylinder and connected with the switching cylinder which is installed in the switch cylinder in an inserted mode in a sliding mode. According to the hydraulic oscillator, fluid is controlled to flow into the oscillator part through the switch cylinder, switching of on and off states of the oscillator is achieved, and the problem that due to the fact that an existing oscillator does not have a switch, when the oscillator operates, the oscillator can only be stopped by stopping pumping is solved; positive meaning is achieved for increasing the drilling speed and improving the drilling efficiency.