In order to study the influence of joint inclination and penetration rate on the mechanical properties of rock-like material, by selecting the prefabricated joint rock-like materials as the research object, a series of uniaxial compression tests on two sets of mortar samples considering different joint inclined angles and penetration rates were conducted. The results show that when the joint inclination angle is0°, the peak strength, peak strain and elastic modulus of the specimens decrease with the increase of the joint penetration rate and the specimens with different penetration rates all show the overall tensile failure. When the joint penetration rate is the same, with the increase of the joint inclination angle, the peak strength of the sample shows a V-shaped change trend. The peak strain of the sample first decreases, then increases and then decreases, while the elastic modulus first increases, then decreases and then increases. The two deformation properties show a good corresponding relationship. Furthermore, the results show that the joint penetration rate plays a major role in the strength, deformationand failure of the specimen compared with the joint inclination angle.