In order to study the bending performance of UHPC wet-joint in precast concrete structures,we carry out the static bending tests on seven UHPC wet-joint beams with different reinforcement ratios and one cast-in-place ordinary concrete beam,and compare and analyze the crack resistance,deformation performance and ultimate bearing capacity of test beams.The results show that both UHPC wet-joint beam and cast-in-situ beam undergo bending failures,and their failure modes are similar.The joints of UHPC wet-joint beam have poor performance in bonding performance between old and new concrete,and it is recommended to arrange short steel bar at the joint in order to increase the crack resistance of the joint surface.The ultimate bearing capacity of UHPC wet-joint beam is not weaker than that of cast-in-situ concrete beam.The increase of the reinforcement ratio at UHPC wet joint can improve the beam’s bending bearing capacity.