The invention relates to a wireless temperature measuring device for rotational molding equipment. The wireless measuring device mainly comprises an insulation box for a thermometer, an end cap for the thermometer, an information acquisition module, an FSK (frequency shift keying) radiofrequency transmitter, a power supply, a FSK radiofrequency receiver, an information processing module and a data processing system, wherein the information acquisition module acquires the temperature inside an oven of a rotational molding machine, the temperature of inside and outside walls of a mold and the temperature of materials, and converts the temperature into electric signals, the FSK radiofrequency transmitter transmits the converted signals to a receiving device, the FSK radiofrequency receivers receives the signals transmitted by the FSK radiofrequency transmitter, the data processing system processes and analyzes the temperature change signals received and acquired by the FSK radiofrequency receiver, and sends feedback the control system of the rotational molding equipment. A five-layer structure between the insulation box for the thermometer and the end cap for the thermometer can efficiently ensure the temperature measuring environment and precision of the equipment. The temperature measuring device can monitor the temperature change in real time, remarkably improve the efficiency of the rational molding, reduce the energy consumption, and improves the quality and the precision of the product.