An electric control box (7) and an air conditioning system (1). The electric control box (7) comprises: a box body (72), an electronic component (71), and a heat exchanger (6), wherein the box body (72) is provided with a mounting cavity (721); the electronic component (71) is provided inside the mounting cavity (721); the heat exchanger (6) comprises a heat exchange body (61) and a collecting tube assembly (620); the collecting tube assembly (620) is used for providing a refrigerant flow for the heat exchange body (61); the heat exchange body (61) is used for dissipating heat of the electronic component (71); and a deflector (77) provided on the lower side of the heat exchanger (6) and used for collecting condensate dripping from the heat exchanger (6). The electric control box (7) can collect the condensate generated by the heat exchanger (6) to avoid short circuit of the electronic component (71), thereby improving the reliability of the air conditioning system (1).