The piston type rain shower valve group consists of rain shower valve, hydraulic alarm bell, anti reset valve, solenoid valve, control chamber water supply pipeline, rain shower alarm valve opening pipeline, alarm pipeline, drainage pipeline, pressure gauge and other components. The piston type rain shower valve has a control chamber, a water supply chamber, and a pipe network chamber. Relying on the piston to drive the seal and seal the water supply port. The pressurization and depressurization of the control chamber change the position of the piston, determining the opening or closing of the rain shower valve. The action of the solenoid valve or opening the emergency manual ball valve can activate the rain alarm valve. The function of the anti reset valve is to seal the inlet channel of the control chamber when the pressure relief rain shower alarm valve in the control chamber is opened, preventing the water supply from being cut off due to the reset of the pressure boosting rain shower alarm valve in the control chamber. When the rain shower alarm valve is closed, the inlet channel of the control chamber is opened to supplement pressure, preventing accidental spraying caused by the opening of the rain shower alarm valve