Spare tire air pressure monitoring device

The invention discloses a spare tire air pressure monitoring device. The device comprises an air pressure detection module, an air valve connector and a display alarm module, wherein the air pressure detection module is arranged in a trunk for arranging a spare tire; the display alarm module is arranged in a driving cab; the air pressure detection module is connected with the display alarm module through a hard line; an LED (light-emitting diode) nixie tube is arranged on the display alarm module. The spare tire air pressure monitoring device provided by the invention is simple in structure and low in cost; by the adoption of the device, a user can be reminded obviously in time when the tire pressure is insufficient, and the tire pressure insufficiency is avoided.