The invention discloses an energy-storage interconnected heat pump system suitable for heat supply of cold regions. The energy-storage interconnected heat pump system suitable for the heat supply of cold regions comprises a main heat pump system composed of a main compressor, a first heat exchanger, a second heat exchanger and a main expansion valve, and an auxiliary heat pump system composed of an auxiliary compressor, a third heat exchanger, a fourth heat exchanger and an auxiliary expansion valve. The second heat exchanger is connected with an energy-storage type heat exchanger through pipelines to form a first external loop, and the third heat exchanger is connected with the energy-storage type heat exchanger through pipelines to form a second external loop. According to the energy-storage interconnected heat pump system suitable for the heat supply of cold regions, low temperature energy is generated through the auxiliary heat pump system to be stored in the energy-storage type heat exchanger so that the main heat pump system can work within a reasonable temperature range, the compression ratio of the compressors can be reduced advantageously, the efficiency of the compressors is thus improved, the system can be normally used in cold regions, and environmental pollution caused by coal heating in winter can be alleviated.