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To solve the problems of poor forming and low corrosion resistance of 316L stainless steel laser cladding layer, the forming, microstructure and properties of single-layer and multi-layer samples prepared at different laser powers were detected and analyzed by microstructure observation, hardness testing, impact testing and electrochemical testing. The results show that the height of the laser cladding layer initially increases and subsequently decreases with the increase of laser power. The content of precipitates and the dilutionrate increase with the increase of laser power. Cracks occur in the laser cladding layer under the condition of low laser power, and it can cause the grains to grow abnormally under the condition of high laser power. Meanwhile, the hardness value of the laser cladding layer increases with the increase of laser power. The hardness value at the interface reach a maximum value of 475 HV when the laser power is 450 W. However, the impact toughness and corrosion resistance of the laser cladding layer decreases as the laser power increases. The maximum impact toughness is 92 J of the laser cladding layer prepared with the laser power of 300 W. Meanwhile, the laser cladding layer prepared with the laser power of 300 W has the best corrosion resistance, with its highest corrosion potential (Ecorr) of -0.3 V and lowest corrosion current density (Icorr) of 0.165 A/cm2, respectively. Therefore, the laser cladding layer prepared at 300 W laser power can obtain excellent impact and corrosion resistance when the laser cladding speed is 3 mm/s, the powder feeding rate is 14 g/min, and the overlap rate is 50%. The research results can provide a reference for the parameter control and performance improvement of laser cladding 316L layer.