The invention relates to a method for making a template for turning down garment collars. The method comprises the following making steps that a one-half basic collar template ABNOM is made according to a neckline shape formed by sewing a front clothes piece and a rear clothes piece and the position of a roll line PZ, the roll line PZ is lengthened to be crossed with a collar middle line AB at a point Q, the ABNOM is a turned-down collar, and a QBNZ is a collar stand; the ABNOM is cut open along a Q'Z' line and is divided into a template AQ'Z'OM and a template Q' BNZ', shearing is performed along a CI line and an EV line in the AQ'Z'OM, lapping and pressing of 2mm are respectively and inwards performed on two sides of I and V points, an AH arc is outwards moved, then shearing is performed along a ID line and a VF line in the Q' BNZ', lapping and pressing of 2mm are respectively and inwards performed on two sides of the I and V points, and the BN length is kept invariant. The method is simple in operation and structure, has a wide application effect and can be widely applied to collars of military, industrial, foreign-trade and civilian western-style clothes produced by enterprises, and the problem that the collarets of turned-down collars are not smooth and are not fit with the neck is solved.