The purpose of the present invention is to provide a hitting device of crop supporting rod which is capable of maximizing work efficiency by installing a supporting rod on the ground and by installing a supporting plate on the top of the installed supporting rod, thereby minimizing damage of the supporting plate, saving the costs, and enabling a worker to perform an operation alone. The hitting device of crop supporting rod according to the present invention includes: a case a hitting device which is installed at an inner lower side of the case such that the hitting device is capable of ascending or descending a guide part which is connected to an inner circumferential surface of the case, and which enables the case to go back to its original position such that a slope of the central axis of the hitting device ascended to a predetermined height coincides with the longitudinal direction of the case an inclination member which is formed between the inner circumferential surface of the case and the outer circumferential surface of the hitting device, which has a top and bottom end of the inclination member supported to the bottom of the guide part and a hitting beetle of the hitting device, and which enables the hitting device to ascend in a state that an ascending hitting device is slantly inclined with respect to the longitudinal direction of the case a hammer which is installed on a top portion of the guide part, which is ascended in a state that the hammer is supported to the top of the hitting device ascended and inclined by the inclination member, and which has an insertion groove formed in the lower side surface thereof in the longitudinal direction of the case and an elastic member which is installed on the top of the hammer such that the elastic member is compressed when the hammer is ascended, and which expands when a slope of the hitting device goes back to its original position such that the hitting device is capable of being inserted into the insertion gro
