The utility model discloses a water boiling automatic control device for a rod-shaped composite insulator. The water boiling automatic control device is composed of a water boiling pool 1, a compositeinsulator 2, an insulator fixing frame 3, a heater 4, a PLC control box 5, a flow meter 6, an electromagnetic valve 7 and the like. Wherein the boiling tank 1 is a sealed container; The composite insulator 2 is installed on the insulator fixing frame 3. The distance between the fixing frames 3 is adjustable according to the length of a composite insulator, the PLC control box 5 sets the water level height (or directly selects the withstanding, middle-gear and high-grade water level), the heater power, the heating temperature and the heating time), the electromagnetic valve 7 controls water flow to be switched on and off, the flow meter 6 monitors the total solution amount, and the temperature probe monitors the solution temperature in real time and feeds back data to control the heating power. The water boiling device for the rod-shaped composite insulator can be used for testing the whole insulator with different sizes, and meanwhile, the water boiling temperature and time can be automatically controlled, so that the water boiling device has stronger practicability.