The invention discloses a handcart type breaker chassis van locking device and a breaker, and belongs to the technical field of high-pressure switch. The handcart type breaker chassis van locking device is designed for solving the problems that an existing handcart type breaker chassis van locking device is provided with many interlocking parts and complex in structure. The handcart type breaker chassis van locking device comprises a locking support, a locking supporting rod and a locking bent plate, wherein the locking support is fixedly installed on a bottom plate of the breaker, the locking supporting rod is rotationally connected with the locking support, one end of the locking bent plate is fixedly connected with the locking supporting rod, and the other end of the locking bent plate is rotationally connected with a chassis van interlocking bent plate of a chassis van. The invention further provides the handcart type breaker with the locking device. The handcart type breaker chassis van locking device is simple in structure, easy to operate, high in reliability, safe and reliable, and effectively guarantees control over switching-in misoperation of the breaker by the chassis van, the number of the interlocking parts is small, and all the interlocking parts are mechanical components.