Automatic pressure control system for stock bin

The utility model relates to an automatic pressure control system for a stock bin, and belongs to the technical field of pressure control. A pressure self-control part is arranged on the upper portionof a stock bin and comprises a pressure detection device, a pressure control device and an alarm. The pressure detection device comprises a stainless steel block and a microswitch, the stainless steel block is adhered to an exhaust hole in the upper surface of the stock bin through a flexible rubber pad, the stainless steel block is located at the bottom of a contact of the microswitch, and at least one microswitch is connected to the alarm; the pressure control device comprises an air blower, a dust remover I, a dust remover II and a pressure release valve, at least one microswitch is connected to the air blower, the air blower is connected with the dust remover I and the dust remover II which are connected in parallel through air pipes in series and extends into the stock bin, the pressure release valve is fixe