In order to study the shear performance of single spigot shear connectors when applied in practical engineering, the shear performance research is carried out with the engineering background of a waveform steel web steel-mixed girder bridge under construction in a certain area, using the finite element modeling method to establish a local model in the connecting part of the steel box girder and the concrete plate, and combining with the practical engineering to carry out the simulation launching test of the spigot connectors and comparing the results of the load displacement curve with the classical theoretical curve, the results match well and verify the modeling correctness. The results of load displacement curve are compared with the classical theoretical curve, and the results are in good agreement, which verifies the correctness of modeling. On this basis, the influence of steel strength and concrete strength on the shear performance of the peg is investigated, and it is found that the shear capacity increases with the increase of peg strength and concrete strength, and the peg strength has a greater influence on the shear capacity than the concrete strength.