The invention relates to a mixed working medium variable concentration volume adjusting absorption heat pump system which comprises an energy storage device, a solution storage tank, a condenser, a throttling gear, a cooling device, an evaporimeter, a high-pressure storage tank, a low-pressure storage tank and a rectifying column. The system uses the energy storage device and the solution storage tank to store and release solar energy and solution potential energy and combines a variable concentration volume adjusting method, so that an air conditioning system can meet working requirements of all weather. By means of the system, the shortcomings in the existing solar energy absorption type refrigeration technology that solar energy using is intermittent and unstable and the like are overcome, all-weather operation of solar energy absorption type refrigeration is achieved, refrigeration coefficient is improved, and the system has the advantages of being efficient, saving energy, being stable and reliable in performance and the like.