CLR series Marine water source heat pump type vertical cabinet air conditioner adopts seawater as cold (heat) source compared with traditional air source heat pump unit, the structure is more compact, no outdoor unit, smaller size, and its energy efficiency ratio is significantly improved. In the heating condition of CLR type air conditioner, when the sea water temperature reaches the low temperature set value, the auxiliary electric heating on the air side will be automatically put into work, so as to ensure that the heating quantity index remains unchanged. It can be used for all occasions applicable to ordinary water chiller, especially for occasions where the water chiller needs to be set up to run independently but needs efficient electricity (such as small ships, etc.).