When a warp is broken during weaving on a loom, the broken warp is mended and restored by a method of restoring a broken warp after mending the same, comprising steps of connecting a mending yarn to the trailing portion of the broken warp to form a mended warp; cutting a normal warp which has been drawn through the same slit between dents as the broken warp is to be drawn through and inserting a mending yarn with a sufficient length between the cut ends of the normal warp, tying the mending yarn connected to the trailing portion of the broken warp to the normal warp drawn through the same slit between the dents as the broken warp is to be drawn through; and pulling the normal warp toward the take-up side so that the mended warp and the normal warp are tightened properly. Thus, the mended warp is drawn through the slit between the dents together with the normal warp.