The invention discloses a raw material cleaning and crushing device for biomass pellet fuel. The device of the invention comprises a crushing tank, a support backing plate, a dehydration chamber, a discharging baffle plate, a dehydration baffle plate, a dehydration push pedal, a water collection chamber, a material collection chamber, a second motor and a cam. The crushing tank is provided with an upper cover, a first motor, a crushing shaft, a fixed blade, a moving blade, a feed pipe, a guide baseboard and a circular cutter group. The support backing plate, the dehydration chamber and the discharging pipe are welded at the lower end of the crushing tank. The discharging baffle plate and a backing plate are movably arranged at the left part of the support backing plate. A sliding groove, a discharge opening, a telescopic rod, the dehydration baffle plate, a push rod and the dehydration push pedal are arranged inside the dehydration chamber. The lower end of the dehydration chamber is provided with the water collection chamber and the material collection chamber. The right wall of the material collection chamber is provided with a movable cover. The upper end of the water collection chamber is equipped with the second motor, a rotating rod, a connecting rod, a support plate, a rotating shaft and the cam. Through the motors for controlling the push rod and the cam, intermittent discharging and automatic extruding-dehydration discharging can be achieved.