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A diamond film was deposited on YT14 cemented carbide using chemical vapor deposition technique. The surface and cross-section morphologies and chemical compositions of obtained diamond film were analyzed using a scanning electron microscope, energy dispersive spectroscopy, Raman spectroscope, and X–ray diffractometer, respectively. The friction and wear tests of diamond film under the water lubrication condition were conducted using a wear tester with the minimum quantity lubrication system, and the effects of wear loads on tribological properties of diamond film were also discussed. The results show that the chemical vapor deposited diamond film is primarily composed of diamond (111) peak, and its hardness, elastic modulus, bonding strength, and roughness are 16.27 GPa, 166.18 GPa, 26.2 N, and 79.2 nm, respectively. Under the water lubrication condition, the average coefficients of friction (COF) of diamond film under the wear loads of 4, 6, and 8 N are 0.117, 0.139, and 0.163, respectively, and the corresponding wear rates of diamond film under the wear loads of 4, 6, and 8 N are 3.87 × 10⁻⁷, 4.26 × 10⁻⁷, and 4.67 × 10⁻⁷ mm³/N • m. This shows that the average COFs and wear rates increase with an increase of wear loads and that the wear mechanism is abrasive wear.