Disclosed is a magnetic strength detection device for magnetic charging motor shell, which comprises a base, a stand column, and a Guass meter, a longitudinal feeding rocking base is mounted on the base, a transverse feeding rocking base is mounted on the upper portion of the longitudinal feeding rocking base, a rotary disc is fixedly mounted on the upper portion of the transverse feeding rockingbase, a chuck is mounted on the upper portion of the rotary disc, a spindle box is mounted at the upper end of the stand column, a worm is mounted in the spindle box, a lower pressing rod is connectedwith one end of the worm, a positioning hook is arranged on one side of the spindle box mounted the lower pressing rod, a spindle is mounted on the end side of the spindle box, a toothed ring is surrounded by the position, corresponding to the worm, of the outer portion of the spindle, a clamping plate is arranged in the spindle box, the toothed ring is located between two sets of clamping plates, the Guass meter comprises a display device and a detection probe, the detection probe is fixedly mounted at the lower end of the spindle. According to the magnetic strength detection device for magnetic charging motor shell, the highest value of the detection can be easily determined, the phenomenon that the deviation of the detection result is large is not caused when multiple measurements aremeasured is avoided, and the detection error is reduced.