Test piece manufacturing device for mudstone interface shear test

The utility model discloses a device for manufacturing a test piece for a mudstone interface shear test, which comprises a lower die holder and an upper die holder which are buckled with each other, the upper end of the lower die holder is open and forms a lower cavity, the lower end of the upper die holder is open and forms an upper cavity, and the bottom wall of the lower cavity and the top wall of the upper cavity are both provided with corresponding clamping key structures. Compared with the prior art, the mud rock direct shear test device has the advantages and effects that different interface forms are formed by producing samples in different shapes, influence factors of mud rock contact surfaces can be researched more deeply during mud rock direct shear tests, complex interface conditions in field environments can be simulated better, and the mud rock direct shear test device can be used for simulating different interface forms. The mechanical properties of the rock under different contact conditions a