The utility model provides a distributor, heat exchanger subassembly and air conditioner, distributor wherein, include: two at least flow splitters, cup joint on the inner wall of throttle pipe at the interval, and wherein, the intra -annular space of two arbitrary adjacent flow splitters and the inner space that sets up the throttle pipe between in form the vortex chamber that switches on. Through the technical scheme of the utility model, on the one hand, having reduced the refrigerant fluid because the uneven probability of the flow direction that the action of gravity caused, having made the refrigerant flow through the toper and divide the reposition of redundant personnel after the liquid portion more even, promoted the homogeneity of heat transfer, on the other hand through forming the vortex, has reduced the velocity of flow of refrigerant, has promoted the heat transfer effect of every heat exchanger flow path, and then has promoted the whole heat transfer effect of heat exchanger.