Refrigerating cycle system adopting heat pump to melt frost

The invention discloses a heat pump defrosting refrigeration circulation system and aims at providing a circulation system capable of storing energy through cooling circulation and providing medium of higher temperature in the process of heat pump defrosting. The refrigerant outlet of the compressor is connected with the refrigerant outlet of a sensible heat exchanger through a four-way reversing valve, wherein the refrigerant outlet of the sensible heat exchanger is connected respectively with the inlet of a first check valve and the inlet of a second check valve; the outlet of the first check valve is connected with the refrigerant inlet of a first latent heat exchanger; the refrigerant outlet of the first latent heat exchanger is respectively connected with the inlet of a throttling set and the outlet of a third check valve; the outlet of the throttling set is respectively connected with the inlet of the second check valve and the inlet of a fourth check valve; the inlet of the third check valve and the outlet of the fourth check valve are respectively connected with the refrigerant inlet of the second latent heat exchanger; the refrigerant outlet of the second latent heat exchanger is connected with refrigerant inlet of the compressor through the four-way reversing valve. The defrosting of the system of the invention takes little time.