Supporting device of tunnel connection channel excavator

The invention discloses a supporting device of a tunnel connection channel excavator. The supporting device comprises a supporting device body, wherein rotating wheels are fixed to the two ends of the lower surface of the supporting device body, a groove is formed in the middle of the supporting device body, a drawer is arranged in the groove, clamping blocks are integrally formed at the two ends of the side wall, located outside the supporting device body, of the drawer, second magnets are arranged on the sides, close to the interior of the supporting device body, of the clamping blocks, clamping grooves are formed in the positions, corresponding to the clamping blocks, of the two sides of the groove in the side wall of the supporting device body, first magnets are arranged on the sides, corresponding to the second magnets, of the clamping grooves, the end, located in the supporting device body, of the drawer is rotationally connected with a protective cover covering the drawer through a hinge, and the drawe