Fan bearing heater

A fan bearing heater is disclosed. The heater comprises a heating cavity body and a sealing cover plate, wherein the sealing cover plate is arranged on the upper part of the heating cavity body, the sealing cover plate can cover the upper part of the heating cavity body, and the heating cavity body is provided with a heating structure, an insulation structure and a temperature monitoring device, and the heating is carried out by setting a heating layer in the sealing cavity body, so that the heat energy can be fully utilized, and the heating cavity body is clean and highly efficient. The heatpreservation layer is arranged on the outer wall of the heater to further store the heat energy to achieve the effect of heat preservation and achieve the purpose of energy saving. An isolation layeris arranged between the heating layer and the heat preservation layer to separate the heating layer from the heat preservation layer so as to effectively improve the safety and the heat preservation performance of the heater.