The invention relates to a wireless body temperature monitoring belt for an immersion suit in the technical field of temperature measurement of body parts. The wireless body temperature monitoring belt comprises an upper computer, an interface converter, a coordinator and a temperature measuring belt body fixed at the waist of a patient. The upper computer is communicated with the coordinator via signal conversion of the interface converter, and the coordinator and the temperature measuring belt body are communicated with each other. The temperature measuring belt body comprises a binding band, an adjustable fixing buckle arranged at one end of the binding band, a waterproof fixing bag at the other end of the binding band, a digital temperature sensor and a router, the digital temperature sensor and the router are arranged in the waterproof fixing bag, the digital temperature sensor is used for measuring body temperature, and the router is sued for receiving test commands or stop commands of the coordinator and transmitting body temperature information and address information. A wireless temperature measuring module is fixed at the waist, thereby temperature measurement results can be monitored in real time and recorded; the belt is fixed by the adjustable fixing buckle, and accordingly temperature measuring points are not easy to move; and the wireless body temperature monitoring belt is simple in system structure, low in cost, high in efficiency and convenient to operate.