Magnetic speed reducing mechanism and hub motor

The utility model provides a magnetic reducing mechanism and a hub motor. The magnetic speed reducing mechanism comprises a driving magnetic sheet, a magnetic conductive support, a driven magnetic sheet and a magnet yoke. The driving magnetic sheet, the magnetic conductive bracket, the driven magnetic sheet and the magnet yoke are coaxially arranged in sequence; the active magnetic sheet is formed by alternately arranging a first preset number of magnetic steels NS; a second preset number of gaps are formed in the magnetic conductive bracket, and the gaps divide the magnetic conductive bracket into a plurality of petals; the driven magnetic sheet is formed by alternately arranging a third preset number of magnetic steels NS; the magnet yoke is fixedly connected with an external part to be decelerated; and the external magnetic driving structure drives the external part to be decelerated to move through the magnetic speed reducing mechanism. The magnetic speed reducing mechanism adopts magnetic force for trans