Vacuum circuit breaker convenient to install

The utility model discloses a vacuum circuit breaker convenient to install, relates to the technical field of installation of vacuum circuit breakers, and solves the problems that after bolts on a first sliding block and a second sliding block are moved out from the side surface of a bottom plate, the distance between the bolts on the two sides cannot be adjusted continuously, and when bases with different widths are encountered, the bolts on the first sliding block and the second sliding block cannot be adjusted continuously. The device comprises a U-shaped base and a mounting seat mounted in the U-shaped base, and a circuit breaker body is fixedly mounted on the upper surface of the mounting seat; two symmetrical clamping grooves are formed in each of the two inner side walls of the U-shaped base, screw rods are rotationally mounted on the two sides of the interior of the mounting base, connecting plates are in threaded connection with the outer surfaces of the screw rods, connecting rods are fixedly connec