The invention relates to a domestic air conditioner without an outdoor unit. The domestic air conditioner without the outdoor unit is characterized in that the domestic air conditioner without the outdoor unit comprises a compressor, a condenser and an evaporator which are arranged in a room, the compressor is arranged in a cooler containing cooling water, the compressor is immersed in the cooling water, a suction inlet and a discharge outlet of the compressor are connected with a low-pressure pipe and a high-pressure pipe respectively, the low-pressure pipe and the high-pressure pipe are connected with a first pipeline and a second pipeline respectively, and the second pipeline is connected with the inlet side of the condenser. Due to the fact that the outdoor unit does not need to be installed, the domestic air conditioner is safe, hidden dangers of maintenance are avoided, the more important point is that the domestic air conditioner can still conduct heating normally in severe cold in the north, and the situation that a domestic air conditioner with the outdoor unit cannot work normally at low temperature in the past is avoided. In the aspect of environmental protection, the domestic air conditioner can also replace an existing central air-conditioning fan coil system, the defect that air channels of fan coils cannot be cleaned is thoroughly overcome, and the problems of inconvenient installation and inconvenient maintenance are thoroughly solved.