The invention discloses a local constant temperature system for an air energy agricultural greenhouse. The local constant temperature system comprises an air energy host, a constant temperature watertank, a heating water pump, a main heating pipe, a main water return pipe, a microcomputer and a seed bed, wherein the main heating pipe and the main water return pipe are positioned at one end of theconstant temperature water tank; the main heating pipe, the main water return pipe and the constant temperature water tank form a plant heating circuit; two groups of water ducts are connected between the air energy host and the constant temperature water tank; and the air energy host, the constant temperature water tank and the water pipe form a water heating circuit. According to the local constant temperature system for the air energy agricultural greenhouse disclosed by the invention, by virtue of local heating, only plants are heated, and the whole greenhouse does not need to be heated,so that the purposes of saving energy and protecting environment are achieved; and the air energy is controlled by the microcomputer, and any manual operation is avoided, so that the manual cost is greatly saved, and zero pollution is realized. Finally, the pipeline can be removed for next planting after planting of annual plants is ended, so that the cost is reduced, and excellent application prospects are brought.