The utility model relates to a ring lock of a stocking frame. The ring lock comprises a ring body. The ring body comprises a main yarn inlet and an auxiliary yarn inlet. Two colored yarn openings are formed in positions between the main yarn inlet and the auxiliary yarn inlet in the counterclockwise direction in the ring body, two or three colored yarn openings are formed in positions between the main yarn inlet and the auxiliary yarn inlet in the clockwise direction in the ring body, the circumferential angle between the main yarn inlet and the auxiliary yarn inlet in the counterclockwise direction is set within the range from 165 degrees to 220 degrees. Since four to five colored yarn openings are formed in two sides of the ring body, at most six lines of colored yarns can be involved in knitting under the condition of single-line yarn feeding of the stocking frame, the colored yarns with four lines and two colors can be involved in knitting during two-line yarn feeding; compared with the prior art, the stocking frame has the advantages that the colors of colored stockings knitted by the stocking frame are richer.