Special bactericide for reverse osmosis water system, has a strong penetration ability to microbial cells, and has a destructive and destructive effect on microbial cells and tissues, and has a good killing and inhibition on bacteria, fungi, algae and other microorganisms in reverse osmosis equipment effect. It is a non-oxidizing bactericide, which has a rapid and effective bactericidal effect; it has a certain peeling effect on the slime formed by bacteria; it is compatible with all membranes; it has a wide pH range, good biodegradability, and does not pollute the environment.