The utility model relates to an oil and gas exploration development drilling technical field that cores, in particular to well drilling is cored with hydraulic pressure instrument of spinning. The device's top connection, connecting cylinder, bearing casing, attach fitting and block stamp cover are connected in order, installation screw motor in the top connection, and the rotor of screw motor isconnected with fairing cap through the universal joint, is equipped with the water conservancy diversion pore on the fairing cap lateral wall, and fairing cap, transmission shaft, the hammering blockbody connect and connect in order, set up bearing group between transmission shaft and the bearing casing, and the cover is equipped with spring and block stamp on the transmission shaft. The utilitymodel discloses an improving the degree of depth and the broken rock efficiency of drill bit wedging, showing the drilling depth that has improved mechanical drilling speed and single drill bit, avoidthe false weight on bit of slim -hole, drilling tool buckling phenomenon's emergence, overcome drilling tool gravity component, buoyancy and frictional resistance's influence, obtains stable weight on bit, the life of extension drill bit reduces downhole accident, guarantees the well bore quality, the improvement well drilling construction quality that cores.