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With low-cost and high-efficiency advantages, wire arc additive manufacturing (WAAM) has become a promising method for preparing high-entropy alloys (HEAs). This study prepared CoCrFeNiMo 0.2 HEA samples using cold metal transfer technology. By changing the deposition parameters, different heat inputs were realized. The forming quality, microstructure, and mechanical properties of the as-deposited CoCrFeNiMo 0.2 HEA samples with different heat inputs were explored by macroscopic observation, optical microscopy, X-ray diffraction, scanning electron microscopy, energy-dispersive spectroscopy, electron backscatter diffraction, microhardness and tensile test at room temperature. Results show that the alloy prepared by WAAM had a typical columnar crystal composition in deposition direction and a strong {100}〈001〉 cubic texture. With the increased heat input, the forming of the sample worsened, and an obvious step effect appeared, increasing the fine grain region between the sample layers. Due to the heat accumulation and poor heat dissipation, the phase with less Mo grew, deteriorating its mechanical properties. The growth direction of columnar crystals in the sample was consistent with the vertical tensile direction, improving the sample's tensile properties perpendicular to the deposition direction. • Wire arc additive manufacturing (WAAM) of CoCrFeNiMo 0.2 high-entropy alloys. • WAAM can produce high-entropy alloys with lower cost and high efficiency. • The effects of heat input on the forming quality of HEAs was investigated. • The microstructure and mechanical properties of the CoCrFeNiMo 0.2 HEAs were investigated. [ABSTRACT FROM AUTHOR]