This study used high-velocity oxygen fuel (HVOF) spraying to prepare WC-10Co-4Cr coatings on the surface of 7075 aluminum alloy and investigated the effects of the propane flow rate, oxygen flow rate, and spraying distance on the coating's porosity, hardness, and wear resistance. The coating exhibited optimal performance of a hardness of 802.79 HV and a wear rate of only 1.24 × 10 −6 mm 3N −1 m −1 when the propane flow rate was 7 m 3·h −1, the oxygen flow rate was 8 m 3·h −1, and the spraying distance was 200 mm. The main wear mechanism of the coating was fatigue wear. Scanning electron microscopy (SEM), energy-dispersive spectrometry (EDS), and thermodynamic analysis showed that WC particles were partially decarbonized to form W 2C during high-temperature spraying. At the interface, Al reacted with free carbon and Co to form Al 4C 3 and AlCo.