The invention provides a double-evaporator air conditioning unit. The double-evaporator air conditioning unit comprises an air duct air pipe A, an air duct air pipe B, a refrigerating system, a differential pressure sensor, a fan, an inlet main air pipe, an outlet main air pipe, a first air valve and a second air valve, wherein the inlet main air pipe and the outlet main air pipe are in communication with an air supply demand area; the refrigerating system comprises a first evaporator, a second evaporator, a first electromagnetic valve and a second electromagnetic valve; the first evaporator is arranged in the air duct air pipe A, and the second evaporator is arranged in the air duct air pipe B. The control method of the unit comprises the following steps that A, control parameters are set; B, refrigeration work is carried out according to an A-path refrigerating state; C, the A-path refrigerating state is switched to a B-path refrigerating state when switching conditions are met; D, the B-path refrigerating state is switched to the A-path refrigerating state when the switching conditions are met; and E, the standby evaporator is defrosted and the evaporation pressure the evaporator in operation is adjusted in the operation process of the unit. The unit and the control method thereof have the advantages of being low in cost and stable in air outlet temperature.