The invention relates to a permanent magnet type stacking device which comprises a power device. The upper portion of the power device is provided with a lifting and placing device. The power device comprises a drive wheel and a driven wheel which are sleeved with a conveyer belt. A baffle is mounted on the side, close to the drive wheel, of the upper portion of the conveyer belt. The freedom degrees of filled cans are fixed by additionally arranging stand plates on the conveyer belt, so that the mechanical structure becomes simple, and meanwhile, operation is reliable. Cans are attracted through a permanent magnet and placed through a die, and a photoelectric switch is utilized to detect the number of the filled cans and to control movement of the conveyer belt and combined action of the magnet and the die, so that the stacking speed is higher, and movement is more reliable.