Provided is a multi-color paint application apparatus, which includes: a paint storage portion having a number of paint containers in the inside of a storage body; a cover portion that can open and close the upper side of the storage body of the paint storage portion; a discharge portion which includes discharge tubes, and auxiliary containers paint discharge valves; a sensor portion having sensors which are respectively fixed to the discharge tubes, in which an alarm sound is produced by a buzzer if electric power is short-circuited; an air inlet portion including a 3-way valve which makes pressure of air selectively flow into the center of the cover portion; a dehumidification portion which is connected with an expansion tube where a drain plug that can remove moisture by adiabatic expansion of the compressed air is formed with the 3-way valve in the air inlet portion; and a spray gun which can selectively spray the compressed air through a switch formed in a handle lever.