Anti-blocking high-pressure water jet sand blasting conveying device

An inclined tee joint is communicated between a water outlet pipe and a water feeding pipe, the inclined tee joint is further communicated with a water return pipe, the water outlet pipe is obliquely communicated with the lower section of the water feeding pipe, and the upper section of the water return pipe is vertically communicated with the lower section of the water feeding pipe. And the bottom end of the water return pipe is communicated with the collecting hopper and is used for enabling the steel grit and the water in the water feeding pipe to flow back into the collecting hopper under the action of gravity when the conveying pump is shut down. According to the utility model, through the communication arrangement of the inclined tee joint, when the delivery pump stops, the steel grit in the section, close to the delivery pump and vertically arranged, of the upper water pipe falls back downwards under the action of gravity, and through the vertical communication arrangement of the upper water pipe and t