The invention relates to a magnetic mechanical device which is used for ensuring solid particles in dust or dregs to form a mutually separated state. The magnetic mechanical device comprises a treatment trough, a stirring device and an energy converter, wherein a groove is formed on the inner wall of the treatment trough; the stirring device is arranged at the inner part of the treatment trough and comprises a main shaft and a stirring impeller arranged on the main shaft, and one end of the main shaft is connected with a drive device so that the drive device drives the main shaft to rotate; the energy converter is arranged in the groove and can generate mechanical vibration and magnetic pulse at the same time, and combined action of the mechanical vibration and magnetic pulse generated by the energy converter and stirring movement of the stirring device can be utilized so as to enable the solid particles of the dust or the dregs to be mutually separated.