The invention discloses a substation general dolly, which comprises a support frame, an operation platform, a double-hinge scissors fork mechanism, a hydraulic cylinder and a brake device. The operation platform is provided with a first guide rail and a second guide rail. The first guide rail and the second guide rail are provided with a first limit plate and a second limit plate respectively. A servo motor is arranged under the operation platform. The servo motor is connected with a first worm gear and a second worm gear. The first limit plate and the second limit plate are connected with a first worm and a second worm respectively. The support is provided with a first displacement sensor. The operation platform is provided with a second displacement sensor. The double-hinge scissors fork mechanism is controlled through the first displacement sensor and the space between the guide rails is adjusted through the second displacement sensor, so that the dolly is allowed to be suitable for maintenance platforms in different heights and circuit breaker chassis in different sizes, and the dolly is wider in application range; and the dolly is universal, so that a large number of dollies in different models do not need to be purchased, and storage space and maintenance cost are saved.