The utility model relates to a 24-inch steel-tooth tricone bit, which belongs to the technical field of a downhole tool for stratigraphical drilling in petroleum engineering. The steel-tooth tricone bit comprises a body, toothed legs and cones, and an eccentric nozzle is arranged in a central hole of the body. According to analysis of fluid mechanics, the steel-tooth tricone bit can ensure that drilling fluid is uniformly sprayed to teeth and tooth grooves of the cones, so that the surfaces of the three cones can be cleaned completely, thus the sharpness of the teeth of the steel-tooth cones is improved, the bit balling is prevented, and the purpose of increasing the drilling speed of the tricone bit is achieved.