The invention discloses a multi-user heating hot water system adopting solar energy and air energy. The multi-user heating hot water system adopting solar energy and air energy is characterized by comprising a heating part and a domestic hot water part, wherein the heating part comprises a solar heat collector, an evaporator, an evaporator, a first coil pipe heat exchanger and an indoor heat exchange coil pipe; the solar heat collector and the evaporator are connected in parallel; the first coil pipe heat exchanger and the indoor heat exchange coil pipe are connected in parallel; and the domestic hot water part comprises a shower end, a sewage flow guide groove, an impurity filter, a sewage heat storage tank, a second coil pipe heat exchanger and a third coil pipe heat exchanger. Accordingto the multi-user heating hot water system adopting solar energy and air energy, a low-temperature heat exchange medium is filled in the indoor heat exchange coil pipe and at a temperature of 35-40 DEG C, and waste heat in shower wastewater is utilized, so that the heating energy efficiency of an air source heat pump is up to 4.6; and meanwhile, the drainage temperature of the shower wastewater is low to 5-7 DEG C, so that low-grade energy in the wastewater is furthest utilized.