Split type overhead motor home air conditioning system and overhead inner unit

The utility model provides a split type overhead motor home air conditioning system which comprises an overhead inner unit and an independent outer unit. The overhead inner unit comprises a panel assembly and an evaporation assembly which are installed on a car roof. The independent outer unit comprises a condensation assembly. The evaporation assembly comprises a first shell, and the volute, the evaporation fan and the evaporator are arranged in the first shell in a covering mode. A heat exchange space is formed between the volute and the first shell; the evaporation fan forms a pressure area in the heat exchange space, so that air enters and exits the heat exchange space through the panel assembly; the evaporator exchanges heat with air entering the heat exchange space; the condensation assembly comprises a second shell, and a condensation fan, a condenser and a compressor are arranged in the second shell in a covering mode. The overhead inner unit is installed at the first position of the roof of the touri