The utility model discloses a support of a mast indicator light. The support comprises a fixed support arm, a movable support arm and a pull part, wherein one end of the fixed support arm is fixedly installed on a mast of a ship, the other end of the fixed support arm is hinged to the movable support arm, the indicator light is arranged at a suspension end of the movable support arm, and the pull part is connected with the movable support arm and can drive the movable support arm to be folded, so that the indicator light is close to the mast. According to the support, the fixed support arm and the movable support arm are adopted, and the movable support arm can be folded relative to the fixed support arm, so that the indicator light installed on the movable support arm is close to the mast during maintenance and inspection, and a maintenance man can operate the indicator light through a vertical ladder conveniently; and the structure of the mast cannot be changed and added, so that the manufacturing cost of the mast cannot be increased.