Down-hole rotary impact type drilling tool

The invention relates to a down-hole rotary impact type drilling tool. The drilling tool is characterized in that an overflowing sleeve (1), an upper transmission spindle (6), a splined hub (8), an impact bearing seat (16) and a lower transmission spindle (22) are sequentially installed in a casing; an upper TC transverse bearing (4) and a rolling ball bearing pack (5) are sequentially installed outside the upper transmission spindle (6); a belleville spring (10), a vibration sleeve (12), a vibration starting seat (13), an impact heat (15), a PDC bearing (18), a lower TC transverse bearing moving ring (19) and a lower TC transverse bearing static ring (20) are sequentially mounted outside the impact bearing seat (16) and the lower transmission spindle (22); the impact heat (15) and the impact bearing seat (16) are connected through a flat key, the lower end face of the vibration sleeve (12) is connected with the upper end face of the vibration starting seat (13) through a flat key, and the vibration starting seat (13) is used for generating axial displacement and transmitting the axial displacement to the vibration sleeve (12) and the impact bearing seat (16). According to the down-hole rotary impact type drilling tool, low-amplitude high-frequency impact force is exerted on a drill, so that rock can be broken by the joint action of high-frequency periodical impact force with static-pressure rotation, the rate of penetration of hard stratums is effectively increased, drilling costs are reduced, and comprehensive technological and economic benefits of the drilling engineering are improved.