Warning device for high-temperature failure of railway wagon braking system

The utility model discloses a high-temperature failure warning device for a railway wagon braking system. Comprising a pointer device, a warning board and/or a pressure release valve, the pointer device comprises a mounting seat, a pointer, a round pin, a fusing pin and a warning mark; the pressure release valve comprises a valve body and a valve core; the warning board is a square warning board made of thermochromic materials and is pasted or hung on the outer side of the truck body. According to the high-temperature failure warning device for the brake system, the high-temperature failure of a non-metal part of the brake system, which is generated during the unfreezing operation of a truck and cannot be observed and judged from the outside, is displayed in an obvious and visual manner through the color of the warning board or the position change of the pointer in combination with the air leakage of the pressure release valve, and a dual warning effect can be achieved; vehicle inspectors and locomotive drive