Heat exchanger and air conditioner system

The invention provides a heat exchanger and an air conditioner system. The heat exchanger comprises a plurality of columns of heat exchanging tubes separated from each other in the transverse direction, and the multiple heat exchanging tubes are arranged on each column; and the heat exchanger further comprises connecting tubes, wherein the connecting tubes are used for forming connection between the heat exchanging tubes so as to form heat exchanging medium flow paths in the heat exchanger, and each connecting tube comprises a first connecting tube which forms connection between the two heat exchanging tubes positioned in the same column and a second connecting tube which forms connection between the two heat exchanging tubes positioned in different columns. According to the heat exchanger, the complex and variable heat exchanging medium flow paths can be formed in the heat exchanger, so that the purpose of improving the heat exchanging efficiency is achieved, in addition, connection between all the heat exch