The QHCJS series top in magnetic stirrer is a device that installs the magnetic stirring device on the centerline or eccentric position of the tank equipment. It mainly consists of a reduction motor, an active magnetic steel body, a passive magnetic steel body, an isolation sleeve, a coupling, a transmission shaft, a stirring shaft and blades, and cooling components. Due to the lack of axial attraction between the active magnetic steel body and the passive magnetic steel body of the QHCJS top in magnetic stirrer, and the fact that the permanent magnet coupling part is far away from the stirred liquid medium, the magnet is less affected by the temperature (high temperature) or corrosion inside the tank. Suitable for tank mixing and blending with large volume, high torque, and large mixing blades. And it is suitable for stirring and mixing liquid media containing particles, with a wide range of applications.