The invention discloses a hydraulic pressure type coring tool which comprises a safe joint, a hydraulic pressurizing device, an outer cylinder assembly, an inner cylinder assembly and a core catcher assembly. The safe joint is of a big-end-up cone shape, the bottom and the top of the safe joint are opened, the middle of the safe joint is connected with the outer cylinder assembly through threads, the lower portion of the safe joint is connected with the hydraulic pressurizing device through threads, the inner cylinder assembly is hung below the hydraulic pressurizing device through a hanging device, the core catcher assembly is arranged on the lower side of the inner cylinder assembly, and the hydraulic pressurizing device, the inner cylinder assembly and the core catcher assembly are located in the outer cylinder assembly. After the hydraulic pressurizing device exerts hydraulic pressure, the hanging device falls off, the inner cylinder assembly and the core catcher assembly fall along with the hanging device, and the core catcher assembly clamps under the action of hydraulic pressure to achieve the aim of completely wrapping a smashing core. When plastic deformation of a core sealing sleeve reaches a certain degree, drilling fluid is discharged from a gap between the core sealing sleeve and a connection sleeve, so that the core can not be compressed excessively, and integrity of the core is guaranteed.