The invention relates to a dredger bearing heating device and belongs to the technical field of ship engineering. The dredger bearing heating device is characterized in that the dredger bearing heating device is a heating metal box type structure, a bearing support is arranged in a heating metal box body, a heating coil is arranged at the bottom of the heating metal box, the heating coil is provided with a control button, and the control button is externally connected with a power line. The dredger bearing heating device does not perform manual heating, fire working is avoided, bearing heating is uniform, the overall expansibility of a bearing is ensured, a heat preservation effect is good, heating and heat preservation temperature can be controlled through a temperature controller, bearing coating damage caused by overheating is avoided, and the dredger bearing heating device has the advantages of being convenient to operate, capable of saving labor, portable and easy to operate, making the bearing installation and working efficiency high and the like.