Cu-10Pb-10Sn cladding layer was prepared on Q235 carbon steel substrate by laser cladding technology. The effect of laser power on porosity, microstructure, and microhardness of the cladding layer was studied. The results show that the change of laser power has a great influence on the macroscopic morphology of lead bronze alloy, and the porosity of the cladding layer decreases first and then increases with the increase of laser power. The holes in the cladding layer are formed because the low melting point substances Pb and Sn in the cladding material do not escape in time after evaporating into metal vapor. In cladding α-Cu (Sn) solid solution and γ-"Liquid phase separation" occurs in Fe phase, and Pb phase is distributed as dot dispersion. The microhardness of the cladding layer is greatly affected by the laser power. The minimum hardness is 104.5 HV, and the maximum hardness is 134.4 HV.