The utility model provides a multifunctional mechanical hammering hole forming machine which can completely replace a diesel hammer. Two common pulley-blocking-using modes of a crane and a forklift are integrated into the same equipment, and a hammer hammers a hole forming steel pipe repeatedly in a guiding frame under driving of an oil cylinder arranged in the middle of a hammering pulley block. Through two humping type winches provided with electromagnetism pushing rods, the hammer, the guiding frame and the hole forming steel pipe can sink to the preset hammered depth of the hole forming steel pipe automatically along with hammering each time. Finally, through lifting winches in the two winches, the hole forming steel pipes which sinks in soil is pulled out for preparation of construction of a next hole. The hammering capacity and the hole forming speed of the machine are higher than those of diesel hammers of various specifications and model numbers, meanwhile, the function that SDDC construction method hammering hole forming and dynamic compaction working are completed is achieved, the machine is a multifunctional energy-saving emission-reducing environment-protecting engineering machine without diesel oil and black smoke, and construction efficiency is improved manyfold.