The traditional test technology of concrete shear loading was discussed and analyzed to explore its shortcomings and causes. And a new test technology and equipment of concrete shear multiaxial loading was designed, and its advantages and feasibility through the test were verified. The results show that there are bending effect, rotation effect and friction effect in the traditional test technology of concrete shear loading, which leads to the difference of shear strength results obtained by different test technologies by 23 times. The influence of bending effect, rotation effect and friction effect on the test results of concrete shear multiaxial loading is reduced by improving the test technology and designing the corresponding equipment and specimen size. The test data obtained by the equipment of this paper verify the feasibility of the new test technology. At the same time, the shear load displacement full curve of concrete is obtained, which provides a good test technology for measurement of the mechanical properties of concrete.