The invention discloses a diamond abrasive wheel mechanism based on 3D printing. The diamond abrasive wheel mechanism comprises a computer three-dimensional modeling machine, a printing machine table and a laser generation assembly. A powder laying assembly, a powder sending assembly and a base work layer are arranged on the printing machine table, wherein the base work layer is of a sandwich type structure. A three-dimensional solid model of a to-be-manufactured product is designed through the computer three-dimensional modeling machine, and the work path of the laser generation assembly is calculated. The powder laying assembly is arranged on one side of the printing machine table and is used for conducting powder laying on the base work layer. The powder sending assembly is cooperatively connected with the powder laying assembly and conducts powder sending operation on the powder laying assembly. The laser generation device is arranged on the printing machine table and conducts layer-by-layer cladding on a powder laying layer of the powder laying assembly. By means of the improvement on the above structure, the diamond abrasive wheel mechanism has the beneficial effects of being simple, reasonable, good in performance, automatic in production, environment-friendly, low in consumption, safe, reliable and high in practicability.