Leakage detection device of pneumatic actuator for valve

The utility model relates to a leakage detection device of a pneumatic actuator for a valve. A P port of a first electromagnetic valve is communicated with a third interface of an upper shell, a P port of a second electromagnetic valve is communicated with a third interface of a lower shell, and a P port of a third electromagnetic valve is communicated with an interface of a shell for leakage detection; t ports of the first, second and third electromagnetic valves are connected in parallel and then are sequentially connected in series with a pressure sensor, a first throttle valve and a first flowmeter; a P port of the fifth electromagnetic valve is communicated with the first connector of the upper shell, a T port of the fifth electromagnetic valve is sequentially connected with a second throttling valve, a second flowmeter and a T port of the fourth electromagnetic valve in series, a P port of the fourth electromagnetic valve is communicated with the first connector of the lower shell, an R port of the four