Brake valve with emergency opening function

The invention relates to the technical field of brake vales, in particular to a brake valve with an emergency opening function. The brake valve comprises a valve body, a valve cover is arranged abovea first connection ring, a first threaded column cylinder penetrates through the top of the valve cover, a cambered connection block is arranged under the first threaded column cylinder, the bottom ofthe cambered connection block is fixedly connected with a main valve plate, a wide blind hole is formed in the middle on one side face of the main valve plate, and four slim blind holes are formed inthe circumferential direction of the side face of the main valve plate at equal intervals. An accessory valve plate is arranged on the other side of the main valve plate, a leakage-proof rubber mat is fixedly arranged on the side face of the accessory valve plate, a thick threaded column is fixedly connected with the middle of the side face of the accessory valve plate, slim threaded columns penetrate into the four slim bl