The present application relates to a heat exchange assembly and a heat exchange system. The heat exchange assembly comprises a first tube, a first member, and retainers. The first tube comprises a first peripheral wall and a first cavity, and at least a portion of the first member is located in the first cavity; a portion of each retainer is located within the first cavity; each retainer comprises a first channel, the first member passes through the first channel, and at least a portion of the first member is located in the first channel; each retainer further comprises a first through hole, and the first through hole runs through the retainer in the length direction of the first tube; in a radial direction of the first tube, the first peripheral wall of the first tube is provided with first slots and second slots; a portion of each retainer is located within the first slot and/or the second slot. The first member is fixed in the first cavity of the first tube by means of the retainers, and the retainers can support the first member, thereby facilitating fixation of an internal structure of the heat exchange assembly, and facilitating improvement of heat exchange performance of the heat exchange assembly.