The embodiment of the utility model discloses a mechanical explosion spraying device, comprising a box body, a shock wave receiving plate capable of swinging and arranged at one side of the box body, and a spraying mechanism fixed inside the box body, wherein the spraying mechanism comprises: a pipeline fixed inside the box body; a master valve arranged on the pipeline; a pull rod of a switch handle connecting the shock wave receiving plate with the master valve; a hanging barrel connected with a reverse extension segment of the switch handle via pulleys, wherein the bottom of the hanging barrel is provided with a water leakage hole; and a three-way valve arranged on the pipeline above the hanging barrel. According to the utility model, the master valve is opened by means of the shock wave generated by explosion so as to realize spraying, and is closed by means of the rotation of the switch handle resulted from the falling of the hanging barrel, the entire movement is fast; energy is stored in a manner of water storage of the hanging barrel, spraying time can be adjusted by adjusting the opening degree of the three-way valve, and the whole device is safe and reliable, simple in structure and convenient for maintenance.