The invention discloses an electric machine capable of on-line self-monitoring running state, comprising a motor body and a magnet fixing plate, the motor body includes a rotating shaft, bearing, a bearing outer end cover, a bearing inner end cover and a motor end cover, wherein the magnet fixing disk is interference-connected on the rotating shaft between the bearing and bearing outer end cover,wherein the magnet surface of the magnet fixing disk and the inner side of the bearing outer end cover are slidably connected, and the back surface of the magnet fixing disk and the outer end surfaceof the bearing are clearance connected; An electric cavity is arranged on the outer end cap of the bearing, and a circuit module and a sensor for monitoring the running state are arranged in the electric cavity, and a lead-out hole for the output wire of the coil winding is arranged. The output wire of the coil winding is electrically connected with the input end of the circuit module, and the output end of the circuit module is electrically connected with the sensor for monitoring the running state. The invention realizes the purpose of synchronous self-monitoring the running state of the motor, not only can the energy consumption be remarkably saved, but also the safety in production is effectively ensured.