Magnetic limit switch

The invention discloses a magnetic limit switch. The magnetic limit switch comprises a first magnet, a second magnet, a third magnet, an upper contact, a common contact, a lower contact, a transmission shaft and a stainless steel shell, the transmission shaft slides up and down, the first magnet, the third magnet and the common contact are arranged on the transmission shaft from top to bottom, the second magnet is arranged in the middle of the vertical transmission shaft, the common contact is arranged at the tail end of the vertical transmission shaft and is a double-face contact, the upper contact and the lower contact are arranged above and below the common contact respectively, the second magnet is fixed on the shell, and the magnetic force of the first magnet is larger than the sum of the magnetic force of the second magnet and the magnetic force of the third magnet. The whole switch module is packaged in the firm brass or stainless steel shell, so the switch module is fully protected, the application ra