The utility model relates to a groove-shaped tool for bypass bridge of low-voltage switchgear, comprising a body and two sliding closures; wherein, the body is a hollow cuboid with a groove; a screw hole for fixing the bolt is arranged in the center of the groove bottom; a locknut and a tight stud are arranged on the bolt in the outside of the groove bottom; the two sliding closures are respectively arranged at the top of the two arms for the body groove; a plurality of long lumbar holes horizontal distributed are milled on each sliding closure, and the long lumbar holes are movably connected with the body via a nut. Since the groove-shaped tool is adopted to switch on the upper pile head and lower pile head of the low-voltage circuit breaker, the utility model has the advantages that the bypass bridge for the drawer low-voltage circuit breaker or draw-out low-voltage circuit breaker in the low-voltage switchgear can be exchanged in the condition of power on.