The invention relates to a waste wood block crushing device, in particular to an environment-friendly crushing device for building waste wood blocks. By the adoption of the environment-friendly crushing device for the building waste wood blocks, the technical purposes of simple operation, small dust amount during crushing, and high working efficiency are achieved. For achieving the technical purposes, the environment-friendly crushing device for the building waste wood blocks comprises a bottom plate, a left frame, a first sliding rail, first sliding blocks, a crushing frame, a right frame, a water tank, an installing frame, a cam, a supporting rod, a fixing plate, a motor, a top plate, a crank, a connecting rod, a moving rod, a crushing hammer, a water pump, a fixing sleeve, a spray head and a spring. The left frame, the first sliding rail, the right frame, the water tank and the like are sequentially arranged at the top of the bottom plate from left to right. By the adoption of the environment-friendly crushing device for the building waste wood blocks, the effects of simple operation, small dust amount during crushing and high working efficiency are achieved; and both the purpose of crushing the waste wood blocks through the crushing hammer and the purpose of shaking the crushing frame can be achieved through only one motor.