The invention relates to a flow distribution valve used for excavator hydraulic auxiliary equipment. The valve is characterized by comprising a valve block, a first channel, a first main plug, a two-position two-way electromagnetic valve, an overflow valve assembly and a flow adjusting valve assembly; an oil inlet, an oil outlet and an oil returning opening are formed in the valve block, a compensation valve element is arranged in the first channel, a load pressure feedback opening and a one-way valve element are arranged on the first main plug, the two-position two-way electromagnetic valve is used for switching communication between a main control cavity and the oil returning opening or communication between the main control cavity and the oil outlet, when the pressure in the main control cavity reaches a certain value, the overflow valve assembly is started, and the main control cavity and the oil returning opening are communicated; the flow adjusting valve assembly is arranged on the valve block and is used for controlling the output flow of the oil outlet. According to the flow distribution valve, the structure is simple and reasonable, machining is convenient, an added work device can be conveniently added into an excavator hydraulic system, the size is compact, and the cost is low.