The invention discloses a vehicle-mounted air-conditioner capable of humidifying. The air-conditioner comprises a ventilation pipe, an air inlet, an air outlet, and an evaporator. One end of the ventilation pipe is the air inlet, and the other end is the air outlet. The evaporator is on the middle part in the ventilation pipe. The ventilation pipe is also internally fixedly provided with an air blower, a coarse filter, and a wet film baffle board. The coarse filter is inlaid with an atomizing spray head. A water resisting board is arranged between the coarse filter and the wet film baffle board. The lower end of the wet film baffle board is also inlaid with a drain pipe. A water duct is arranged on the atomizing spray head. The tail end of the water duct is connected with a water tank. Thewater duct is also connected with a filter and a water pump. The water pump is connected with a control host and a humidity sensor through wires. Beneficial effects are that the vehicle-mounted air-conditioner has a humidifying function, and can automatically determine whether humidification is needed according to air drying conditions in a vehicle, automation degree is high, and practicability is high.