Expansion fracturing device

The utility model relates to the technical field of coal mining, in particular to an expansion fracturing device which comprises a water inlet pipe, a water outlet pipe and a hydraulic control system.The expansion body comprises a head expansion body arranged at the front end of the expansion fracturing device and a tail expansion body arranged at the tail end of the expansion fracturing device,a water inlet pipe connecting hole is formed in the expansion body in the axial direction of the expansion body, the water inlet pipe is connected with the inner wall of the water inlet pipe connecting hole, and a blocking body is arranged at the front end of the head expansion body; the blocking body is used for preventing water from overflowing from the front end of the first expansion body; theexpansion body connecting pipes are used for connecting adjacent expansion bodies, and water outlet holes are formed in the side walls of the expansion body connecting pipes. Through the arrangementof the water inlet pipe, the