The invention discloses a laser composite manufacturing technology of parts. The laser composite manufacturing technology comprises the following steps: S1, loading a model; S2, preprocessing the model; S3, slicing; S4, performing a material additive manufacturing technology; S5, judging whether surface roughness meets the requirement or not; S6, carrying out laser remelting and laser polishing; S7, judging whether dimensional accuracy meets the requirement or not; S8, carrying out laser ablation and laser engraving; S9, judging whether surface quality meets the requirement or not; S10, carrying out laser quenching and laser oxidation; S11, judging whether the manufacture of the model is finished. The laser composite manufacturing technology integrates the laser material additive manufacturing technology, a laser material subtractive manufacturing technology and a laser surface modification technology, thus being capable of effectively improving the dimensional accuracy, surface smoothness and compactness of the parts, improving the surface quality of the parts, and realizing one-time molding of the parts.