The utility model relates to an operating device of a multipole miniature circuit breaker, which comprises a handle, a rotating plate, two pairs of contacts, two electromagnetic tripping devices and two thermal tripping devices, wherein the rotating plate is pivoted on a shell through a mandrel, the two pairs of contacts are in closing/opening matching, the two electromagnetic tripping devices are arranged side by side, and the two thermal tripping devices are arranged side by side. The operating device further comprises a tripping connecting rod, a tripping rod, a U-shaped rod, two short-circuit short columns and two overload short columns, wherein the tripping connecting rod is provided with a lock hook and pivoted on the rotating plate through a first hinge shaft; the tripping rod is pivoted on the rotating plate through a second hinge shaft and provided with a lock tooth, a manipulating element and an actuating rod, the manipulating element can be matched with the electromagnetic tripping devices of circuit breakers at two adjacent poles, the actuating rod can be matched with bimetallic strips of the thermal tripping devices of circuit breakers at two adjacent poles, two ends of the U-shaped rod are in hinged connection with the handle and the tripping connecting rod, the two short-circuit short columns are arranged on the manipulating element side by side and respectively in touch cooperation with the actuating ejector rods of the two electromagnetic tripping devices, and the two overload short columns are arranged on the actuating rod side by side and respectively in touch cooperation with the bimetallic strips of the two thermal tripping devices. The tripping rod can be controlled by the adjacent two groups of independent tripping devices, the size is small, the structure is compact, and the action is more reliable.