Heat exchanger and air conditioning system

The invention discloses a heat exchanger and an air conditioning system. The heat exchanger comprises a first flow collecting piece, a second flow collecting piece and a plurality of rows of heat exchange single body rows. When the heat exchange single body row comprises the multiple heat exchange single bodies, the multiple heat exchange single bodies of the heat exchange single body row are sequentially arranged in the third direction, heat exchange channels extending in the first direction are formed in the heat exchange single bodies, and the two ends, in the first direction, of the heat exchange single bodies are connected with the first flow collecting piece and the second flow collecting piece correspondingly. An air flow channel is defined between every two adjacent heat exchange single body rows, the extending track of the heat exchange single body rows in the third direction is nonlinear, and the first direction, the second direction and the third direction are perpendicular to one another. Accordin