The present invention relates to a cooling / heating system for a refrigeration vehicle using a phase change material, and more particularly, to a cooling / heating system for a refrigerator, which transfers a cooling power of a refrigerant cooled by an AC refrigerator installed on a ground or a vehicle to a low- temperature latent heat PCM A portion of a brine flow rate to be conveyed in one of the on-board axial cooling units installed on the vehicle is distributed and supplied to the on-board axial cold storage unit through a brine to supply the cooling air to the on- An indoor heat exchanger in which the brine is circulated and an indoor fan and a motor for supplying cool air supplied through the brine to the indoor heat exchanger to the cab using forced convection. The indoor heat exchanger further includes a plurality of flow passages for circulating the cooling and heating brines, respectively, to one heat exchanger and the heat exchanger, The fan can supply cool or warm to the cab.
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