The invention relates to a pulse WOB generator. The generator is composed of a pulse hydraulic pressure generation system and an impact type WOB transmission system. The pulse hydraulic pressure generation system includes an upper joint, an upper casing, a centering bearing, a screw turbine and a shaft. A valve system, the shaft valve system includes a turbine shaft, a bearing, a bearing end cover, a valve core, a valve seat and a balance sleeve, and the impact WOB transmission system includes a lower joint, a lower casing, a disc spring group and a pressure bearing head The generator forms periodic pulse hydraulic pressure and transmits the hydraulic pressure to the drill bit to form a periodically fluctuating WOB. The design structure of the WOB transmission system is simple, and the disc spring group will periodically change under the action of the periodically changing hydraulic pressure. Compression and elastic recovery can directly transmit the pulse hydraulic force to the bottom hole drill bit, with high pressure transmission speed and high efficiency.