To systematically study the influence of arc ion plating bias on the structure and performance of ta-C film, clarify the mechanism of bias on the structure and performance of ta-C film, and provide a certain theoretical basis for expanding the application of ta-C film. The bias voltage process of arc ion plating was changed to deposit ta-C monolayer on the surface of cemented carbide substrate. Field emission scanning electron microscopy (SEM) was used to characterize the surface and cross-sectional micro-morphology of ta-C film. Raman spectroscopy and X-ray electron energy spectroscopy (XPS) were used to characterize the phase structure of ta-C film. Using a scratch tester to measure the ta-C film binding force, a stress meter to test the residual stress of ta-C film, the indentation test and nano hardness tester to measure the toughness and hardness of ta-C film, and a friction and wear testing machine to test the friction and wear performance of ta-C film. As the bias voltage increased, the number of large-size carbon particles on the surface of the ta-C film gradually increased, and the number of small-sized carbon particles gradually decreased due to reverse sputtering. The hardness of the ta-C film, sp3 bond content and residual stress are now increased and then decreased, the bias voltage is ?180 V. As the bias voltage is increased, the binding force of the ta-C film and the substrate first increases and then decreases, and the maximum value is reached when the bias voltage is ?140 V. With the increase of bias voltage, the wear resistance first increases and then decreases, when the bias voltage is ?140 V, the lowest wear rate is 1.39×10?7 mm3/(N.m). The incident energy of the ta-C film deposited on the substrate surface increases, the number of large particles on the surface gradually increases, the residual stress in the film layer increases, the hardness increases, and the wear resistance increases. As the bias voltage increases due to the reverse sputtering effect, the small-sized particles on the surface of the film layer gradually decrease, the degree of graphitization in the film layer increases, and the wear resistance of the ta-C film decreases.