The utility model provides a popgun capable of shooting water absorbing crystal balls. The popgun comprises a gun body, a sliding block, a shooting structure and a trigger mechanism. The shooting structure is formed by sequentially and axially connecting a gun tube, a ball filling device, an air chamber, a piston and a spring. The ball filling device is a tubular body and is provided with a one-way input structure composed of an annular ball outlet, a one-way ball head and a spring. The head of the air chamber can be inserted in the ball filling device in sliding mode, the front end of the head of the air chamber is shrunk, and a porous structure in fan-shaped distribution is formed on the end face. The trigger mechanism is formed by a trigger piece, an annular piece and the spring and is connected with a gun tube opening closing device. The popgun utilizes soft materials like the water absorbing crystal balls as bullets, is capable of effectively preventing use of non-specific balls and is novel in conception and unique in structure.