The device is especially for pile foundation engineering. It has a hammer and a first auxiliary impact device, wherein the first auxiliary impact device is combined with the hammer. And at least one nozzle is arranged at one end of the first auxiliary body of the first auxiliary impact device so that when the hammer vibrates the formation in a vibratory manner by means of the first pressurizing device of the first assisting percussion device, it can use high-pressure water jetting to impact the stratum so as to loosen the tight strata and decrease the working hours. Furthermore, this can also reduce the wearing of drill bit. This invention can lessen not only the required cost, but also energy and carbon consumption.