The invention discloses a silicon material cleaning method. A body structure of a silicon material cleaning device is designed into a cleaning tank. A cleaning tank cover is placed on the top of the cleaning tank. A cleaning roller is arranged in the cleaning tank and internally provided with a cleaning brush. Power is provided for the cleaning roller through a drive motor. A speed adjusting device is arranged on the right side of the drive motor. A connecting bearing is arranged between the speed adjusting device and the cleaning tank. An ultrasonic generator is arranged at the bottom of thecleaning tank. The cleaning method comprises the steps that a silicon material is subjected to ultrasonic ethanol-water flushing and then is immersed through dilute alkali liquid, then, spraying is conducted through dilute acid liquid, finally, high-pressure washing is conducted, and then drying is conducted after water spinning-dry. By means of the silicon material cleaning method, impurities onthe surface of the silicon material can be effectively cleaned away, the reaction is stable, heat is basically not generated, and the oxidization reaction is not generated; and pollution to the silicon material due to oxidization is avoided, and the silicon material quality is improved; and the silicon material loss rate is reduced, and cost is saved.