The invention discloses a household direct current variable-frequency air-conditioning system comprehensively utilizing solar photo-thermal energy and photoelectric technique. The household direct current variable-frequency air-conditioning system comprises a solar photoelectric system, a solar photo-thermal system, a dehumidification system, a direct current variable-frequency air conditioner and a control system; the solar photoelectric system comprises a solar photovoltaic panel, a control module, a storage battery and a boost circuit; the solar photo-thermal system comprises a solar evacuated collector tube, a heat preservation water tank, a dehumidification heat exchanger, a defrosting heat exchanger, and a circulating water pump; the dehumidification system comprises a dehumidifier, a dehumidification liquid storage pot, a dehumidification system heat exchanger, a solution circulating pump, a regenerator and a regeneration liquid storage pot; the direct current variable-frequency air conditioner comprises an indoor unit and an outdoor unit; the control system comprises a temperature controller, a humidity controller and a power supply controller. The household direct current variable-frequency air-conditioning system comprehensively utilizing solar photo-thermal energy and photoelectric technique has the advantages that solar energy can be converted into heat energy and electric energy for providing the air-conditioning system with heat and power, demand on mains supply is reduced, energy is saved, and the like.