The invention discloses a dumping method for a vibratory pile hammer. The dumping method includes the steps of immersing tube, forming the soil sampling tube, unloading soil, unplugging the soil sampling tube, dumping and restoring the soil sampling tube, wherein the soil sampling cabin comprises a base (8), a door (7) welded by a blade (9) and a limited board (11), a lug base (10), a door hinge (12) and a door hinge base (13); a pair of lug bases (10) is symmetrically welded on the inner wall of the base; four pairs of door hinge bases (13) are symmetrically welded on the inner side of the base (8), the door (7) is connected with the door hinge base (13) through the door hinge (12); the soil sampling cabin is separated from the long steel pipe, the lower ends of the two steel ropes are tied to lugs of the soil sampling cabin separately, and the other ends of the steel ropes are connected with a winch on the vibratory pile hammer. The winch releases the steel rope when the soil is dumped, and the soil sampling cabin will drop from the end of the long steel pipe because of gravity, so that the soil can be dumped quickly from the gap between the long steel pipe and soil sampling cabin. The dumping method for vibratory pile hammer has the advantages of being quick in dumping, high efficiency and avoiding latch consumption.