A shooting device (1) of a toy gun is provided. The gun body (10) has an air cylinder (11), a chamber base (12), a barrel (13), and a magazine (14). The chamber base (12) has an air chamber (120). The barrel (13) has a bullet passage (130). The magazine (14) is disposed at a side of the barrel (13). The triggering structure (20) has a slide assembly (21), a latch (22), and a trigger linkage (23). The slide assembly (21) pushes the bullets (2); the trigger (30) pushes against the trigger linkage (23) by an external force to move the next bullet back to the magazine (14) and seal the magazine (14). Therefore, the shooting device satisfying the users' requirements is provided.