A snow plow unit is characterized by comprising a snow blade, mounting seat assemblies and a cross beam steel pipe; each snow blade is of left-right split structure and is in plow shape, each snow blade is formed by welding two involute arc plates and a connection plate, the mounting seat assemblies are fixedly connected to the left and right show blades respectively, and two ends of the cross beam steel pipe are fixed to the mounting seat assemblies. The snow plow unit is formed by connecting mounting seats, the snow blades and the cross beam steel pipe in a whole; the snow plow unit mounted at the front end of a steering frame is capable of effectively cleaning snow in a rail to avoid the faults, such as short circuit of equipment due to high snow accumulation, is simple in structure, light in weight and convenient to adjust and ensures driving safety.