The utility model relates to an ice coating test environment simulation device of a long insulator string, which is characterized by comprising a test chamber. A cold air blast system and a spraying system are arranged in the test chamber, and a water treatment system is arranged outside the test chamber. The cold air blast system comprises two cold air channels arranged in the test chamber, the top wall of the test chamber is provided with a top air channel, and the top air channel is communicated with the two cold air channels. The spraying system comprises two rows of array centrifugal fans arranged in the test chamber, and one ice coating water circulating pipe and one row of array spray nozzles are arranged in front of air outlets of the two array centrifugal fans respectively. The water treatment system comprises a deionized water device, the deionized water device is connected with an ice coating water tank through a water outlet pipe, and the outlet end of the ice coating water tank is connected with the two ice coating water circulating pipes through water pumps. The device can truly simulate the ice coating environment of the long insulator string, an effective method is provided for understanding and researching the ice coating phenomenon of the long insulator string, and the device can be widely applied to the ice coating test process of the long insulator string.