The invention belongs to the technical field of robots, in particular to a biped fire extinguishing robot, comprising a fixing plate and two walking bottom plates. The two ends of the fixing plate arerespectively installed with steering rudders. The output shaft of each steering rudder is vertically downward arranged and fixedly connected with a steering disc, and the steering disc is fixedly connected with a connecting rod of the rudder. Each traveling bottom plate is provided with a horizontal steering gear, the output shaft of the horizontal steering gear is horizontally arranged and is the same as the advancing direction of the traveling bottom plate, and the output shaft of the horizontal steering gear is fixedly connected with the connecting rod of the steering gear; A water storagetank is installed above one traveling bottom plate, and a water pump is installed above the other traveling bottom plate. The water storage tank is communicated with the water pump, and the water outlet of the water pump is communicated with the water spraying pipe. The invention can realize the quick obstacle-crossing and automatic fire-extinguishing functions of the fire-extinguishing robot.