In order to study the shear capacity of steel-ultra-high performance concrete composite bridge stud connectors, the nonlinear numerical simulation of the test process of the test piece was carried out by using ABAQUS finite element software, and the load-relative slip curve was adopted. The analysis verifies the effectiveness of the numerical simulation method. The effects of sensitive parameters such as ultra-high performance concrete strength, stud diameter and length on the shear capacity of the stud connectors were studied. The results show that the ultimate shear capacity of the stud connectors increases with the increase of ultra-high performance concrete strength, the diameter of the studs and the length of the studs. The ultimate shear capacity of the stud connectors is linearly related to the diameter of the pegs. Compared with the diameter and length of the stud, the ultra-high performance concrete compressive strength has a relatively small influence on the shear bearing capacity of the stud connector.