Provided is a forced evaporative humidifier using nano-vapor, which includes: a housing having an exhaust port formed in an upper surface thereof and a suction port formed at one side of a front surface thereof; a water tank located below the suction port to store water; an injection unit having an injection nozzle located above the suction port, a pump for pulling up the water in the water tank to the injection nozzle, and a transfer tube for transferring the water pulled by the pump; a blowing fan located above the injection nozzle to carry air toward the exhaust port of the housing; a humidifying unit located below the injection nozzle so that films, each having a body surface formed to allow the water injected from the injection nozzle to flow and a plurality of tube-type spacers protruding on the body surface, are stacked in a lateral direction therein; and an eliminator located between the blowing fan and the injection nozzle to prevent water drops included in a humid air humidified by the humidifying unit from being scattered.