The invention discloses a self-elevating drilling platform and an automatic uniform-load planet differential lifting device of the self-elevating drilling platform. The automatic uniform-load planet differential lifting device comprises multiple lifting units. Each lifting unit comprises a motor, a main speed reducer, a planet mechanism, an idler pulley, a first climbing gear, a driven gear, and a second climbing gear, wherein the motor is provided with a motor shaft, the main speed reducer is provided with an input shaft and an output shaft, the input shaft is connected with the motor shaft, the planet mechanism comprises a planet speed reducer and an inner and outer gear ring device, the output shaft is connected to the planet speed reducer, the inner and outer gear ring device is not connected with the main speed reducer, the first climbing gear is connected with the planet speed reducer, the idler pulley is meshed with the inner and outer gear ring device, the driven gear is installed on a connecting shaft, the driven gear is meshed with the idler pulley, the second climbing gear is fixedly connected to the connecting shaft, and the second climbing gear and the first climbing gear are equal in rotation speed and opposite in direction. The automatic uniform-load planet differential lifting device is safe in structure, high in reliability, high in operation stability, and high in automatic uniform-load ability.