The invention belongs to the technical field of automatic valves, and provides an automatic valve system, capable of providing dual protection, driven by a single-action pneumatic actuator. The automatic valve system comprises a main pipeline, a main valve, the single-action pneumatic actuator, a two-position three-way solenoid valve and a two-position three-way reversing valve. The main valve is arranged on the main pipeline. The single-action pneumatic actuator is connected with the main valve. The two-position three-way solenoid valve comprises a first inlet, a first outlet and a first vent. The first inlet is connected with a pneumatic air source. The two-position three-way reversing valve comprises a second inlet, a second outlet and a second vent. The second inlet is connected with the first outlet. The second outlet is connected with a cavity of the single-action pneumatic actuator. One of the first two-position three-way valve and the second two-position three-way valve is the two-position three-way solenoid valve, and the other one is the two-position three-way reversing valve. A pressure transmitter and a controller are arranged on an upstream pipeline. The controller controls the working state of the two-position three-way solenoid valve according to the signal of the pressure transmitter. The pressure cavity of the two-position three-way reversing valve is connected with the upstream pipeline through a communicating pipe.