Heat exchanger and air conditioning system

The utility model 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 heat exchange single bodies, the first flow collecting piece is provided with a first flow collecting cavity, the second flow collecting piece is provided with a second flow collecting cavity, and each heat exchange single body comprises a heat exchange single body and cooling fins; the cooling fins are arranged on the outer surface of the heat exchange single body and integrally formed with the heat exchange single body, the two ends of the heat exchange single body are connected with the first flow collecting piece and the second flow collecting piece respectively, the heat exchange single body is provided with a heat exchange channel, and the heat exchange channel communicates with the first flow collecting cavity and the second flow collecting cavity. According to the heat exchanger provided by the embodiment of the utili