The invention provides a stacked type finned tube heat exchanger which comprises multiple heat exchange units, a liquid inlet main pipe, a liquid outlet main pipe, multiple bent pipes, side plates, supporting pipe plates, an upper air channel, a lower air channel and air channel square flanges. Each heat exchange unit comprises multiple finned tubes and a shell. All the heat exchange units are fixed mutually by welding the shells. A heat exchanger body is composed of the multiple heat exchange units. The finned tubes of the heat exchange unit located at the bottom of the heat exchanger body are connected with the liquid inlet main pipe, and the finned tubes of the heat exchange unit located on the top of the heat exchanger body are connected with the liquid outlet main pipe. The two supporting pipe plates are welded to the upper end and the lower end of the heat exchanger body correspondingly. The side plates are welded to the two sides of the heat exchanger body correspondingly. The air channel square flanges are arranged between the side plates and the upper air channel and between the side plates and the lower air channel correspondingly. According to the stacked finned tube heat exchanger provided in the execution mode, the production and design cost can be reduced, and the production efficiency can be improved.