To provide a method and an installation for stacking products in order to package them in a box.

In order to group and stack the products which are thin and rectangular solid-shaped, the products are stored and fed by means of a first feed conveyor 2, and an interval between the products is formed by means of a high-speed supply conveyor 3. By means of a multistage comb-shaped collector 4 which bestrides the supply conveyor 3, and can be movable vertically and horizontally, the products on the supply conveyor 3 are taken out and sequentially stacked in the core 5 of the collector 4. After the specified number of products are taken out, a family of the stacked products are totally pushed out of the collector 4, and transferred to a making-up device 10 for box packing as a subsequent process by the backward movement of the collector 4.