The invention discloses a production method of diamond micro-powder, belongs to the field of production of diamond abrasives and solves the problems of high impurity content and low intensity of existing diamond micro-powder. The production method comprises the following steps of: carrying out crushing; carrying out shaping; carrying out purification; carrying out rough fractionation; carrying out fine fractionation; carrying out centrifugal drying to obtain a finished product. The invention provides the production method of the diamond micro-powder with high content, centralized granularity and a regular particle shape; quality of the diamond micro-powder is improved; the processing material requirements of precision devices are met.