The invention relates to an ice-coating experiment environment simulator of a long insulator string. The simulator is characterized in that the simulator comprises a test chamber, the inside of the test chamber is provided with a cool air system and a spraying system, the outside of the test chamber is provided with a water treatment system; the cool air system comprises two cool air ducts which are arranged in the test chamber, the top wall of the test chamber is provided with a top air duct, the top air duct is communicated with the two cool air ducts; the spraying system comprises two row-array centrifugal fans which are arranged in the test chamber, ice-coating water circulating pipelines and a row-array nozzle are separately arranged in front of the air outlets of the two array centrifugal fans; and the water treatment system comprises a deionized water device, the deionized water device is connected with an ice-coating water tank through a outlet pipe, and the outlet end of the ice-coating water tank is connected with the two ice-coating water circulating pipelines through a water pump. The invention can simulate the ice-coating environment of the long insulator string more vividly, provide an effect method for realizing and researching the ice-coating phenomenon of the long insulator string and be widely used in the ice-coating experiment process of the long insulator string.