The invention relates to an aligning assembling mechanism for products. The aligning assembling mechanism comprises an aligning base plate, wherein aligning carriers are respectively arranged on left and right sides of the upper part of the aligning base plate in a sliding form; an aligning substrate is mounted between the two sets of aligning carriers on the aligning base plate; pull rod moving blocks are respectively arranged on the two sides of the aligning substrate; a moveable pull rod is moveably arranged between the two sets of pull rod moving blocks; a pull rod limiting bulge is arranged on the moveable pull rod; aligning push blocks are fixed on the aligning carriers; and aligning push block slide slots matched with the pull rod limiting bulge are formed on the aligning push blocks. According to the invention, two lens bracket components are respectively arranged on left and right aligning carriers and are used for primarily positioning; the moveable pull rod is pulled to rotate along a pull rod rotating shaft; when the pull rod limiting bulge moves along the aligning push block slide slots, the synchronous movement of the two sets of aligning carriers from the two sides to the center can be realized; the accurate alignment of the products can be realized; the screw locking operation for the subsequent products can be conveniently performed and the product assembling operation can be performed.