The invention belongs to the field of technical equipment used in oil and natural gas drilling engineering, mine exploiting, geological drilling, constructional engineering, tunnel engineering, shielding and non-excavation, and relates to a novel PDC drill bit utilizing the impact effect for improving heart rock breaking efficiency. The PDC drill bit solves the problems that in the drilling process, a center rock column left in the center part influences drilling efficiency, and the position deviating from the center of a well hole shakes left and right. According to the technical scheme, the upper end of a turbine is fixed through a nut, the lower end of the turbine is fixed through a boss on a turbine shaft, an upper cam is connected to the turbine shaft through threads, a lower cam is fixed to a punch hammer through a sunk screw, the upper section of the punch hammer is hollow, a pore passage enabling drilling fluid to flow out is formed in the upper end of a shell on the lower portion, a pressing head with the top end provided with a tip-shaped PDC tooth is added to the tail end of a connecting cavity, as a main impact part, the lower end of the punch hammer becomes thin, and a bi-directional thrust ball bearing is placed at the lower end. The equipment enables the heart to generate longitudinal impact, improves the rock breaking efficiency and reduces drilling cost.