The effect of laser remelting on the forming quality and mechanical properties of sample components during the preparation of TC4 titanium alloy using selective laser melting (SLM) is examined. According to the experimental results, the upper surface quality and densities of TC4 samples improve with increasing laser remelting iterations, and the upper surface roughness and densities improve from 13.2 μm and 98.43% without remelting to 8.7 μm and 99.23% with remelting twice, respectively. The side surface quality, however, does not alter considerably. The elongation increases and improves with laser remelting iterations, from 1.15% to 1.33%, but the tensile strength remains constant. Observing the microstructure of the TC4 sample, the acicular martensite α′ phase occupies the microstructure of the TC4 sample before and after laser remelting.