The mechanical behavior of lintel-column joints in antique buildings can be improved by adopting a steel-concrete composite structure and setting viscous dampers at the Queti. For the study of its mechanical properties, three specimens were designed and tested, namely, two specimens with viscous dampers and one specimen without viscous damper for comparison. The failure process and mechanism of the lintel-column joints in antique buildings were analyzed using the three specimens under dynamic cyclic sine wave loading. Based on the experimental results, the mechanical properties of the lintel-column joints were analyzed, including the restoring force characteristic curve, skeleton curve, and changes in ductility and stiffness. The results indicate that the seismic behavior of the lintel-column joints in antique buildings with steel-concrete composite structures was improved to a certain extent. The beam hinge mechanism was formed when the structure was damaged, which meets the seismic design requirement. Viscous dampers at the Queti can enhance the bearing capacity and deformation performance of joints and restrain the stiffness degradation rate of the specimen to a certain extent. Overall, the general seismic performance of the structure has been greatly improved.