In order to investigate the corrosion and wear performance and wear mechanisms of TiN and TiAlSiN nanocoatings prepared by high-power pulsed magnetron sputtering, TiN and TiAlSiN coatings were deposited on AISI 304 stainless steel substrates using high-power pulsed magnetron sputtering technology. The phase structure of the coatings was analyzed using X-ray diffraction(XRD). The nanohardness and Young's modulus of the coatings were measured using a nanoindentation instrument, and the adhesion strength of the two coatings was evaluated using a micro-scratch tester. The corrosion and wear performance of the coatings in air and in NaCl solution were studied using an electrochemical in-situ corrosion wear instrument. Results showed that both two coatings exhibited similar face-centered cubic(FCC) structures with smooth and dense surfaces. The hardness of the TiN coating was 19.3 GPa, while the hardness of the TiAlSiN coating increased to 38.1 GPa. The critical load for failure of the TiAlSiN coating's scratch adhesion strength was 27 N, more than twice that of the TiN coating, and the scratch morphology was smooth without spallation failure. Under the same wear conditions, the TiN coating suffered severe spallation, leading to fluctuations in the coefficient of friction, with the wear mechanism dominated by severe abrasive wear. The wear tracks of the TiAlSiN coating displayed fine plowing grooves, and the wear mechanism was a combination of abrasive wear and oxidative wear. Furthermore, the TiAlSiN coating exhibited stronger water-lubrication performance than the TiN coating, with a friction coefficient of 0.1 and an open circuit potential of-0.088 V. In conclusion, the TiAlSiN coating demonstrated higher hardness and toughness compared to the TiN coating, enhancing its ability to resist crack initiation and propagation, while showing excellent corrosion and wear resistance.