The invention relates to a method for processing an insulated iron weight of a motor stator coil, and belongs to the technical field of hydraulic generators. The method comprises the following steps of: processing of a straight iron weight, a standard clamp, an end part clamping plate and a support handle, wherein the processing of the straight iron weight comprises that: the straight iron weight is processed by blanking according to the length of the iron core of the stator coil and the size of discharging groove openings on both sides, and the upper iron weight of the straight iron weight can be pressed at the R corner at both ends of the straight line of the coil; angle pins with the size of 0.5 to 2mm are processed at both ends of the straight iron weight; the processing of the ring comprises that: according to the elevating quantity of the straight lines of the coils at both ends of the small face of the iron weight, a ring is designed on the small face of the iron weight at both ends according to the width of the anti-corona structure of the end part of the coil, and the ring is cut into the size of 15 to 20mm and welded on the small face of the iron weight, so that the smooth transition from the coil straight line to the end part insulated corner-the R corner is realized. The method has the advantages of simple process, convenient profiling, improvement of end part compactness and sectional dimension of the coil, high appearance quality and insulated property, high energy efficiency, long service life of the motor and the like.