Self-adaptive fence

The invention discloses a self-adaptive fence, and relates to an electric power tool, in particular to the self-adaptive fence. The invention provides the self-adaptive fence with the advantages thatthe structure is simple, the processing is convenient, and the operation is reliable. The self-adaptive fence comprises a pair of handrails and a cloth belt arranged between the pair of handrails, andalso comprises a placement cylinder and an air bag, wherein a placement hole used for accommodating the placement cylinder is formed in the cloth belt; the air bag is in an H shape; the air bag is arranged in the placement cylinder; two air nozzles are arranged in the middle part of the air bag; through holes used for accommodating the air nozzles are formed in the placement cylinder; the two airnozzles are positioned at two sides of the cloth belt; and sealing covers are detachably arranged at two ends of the placement cylinder. The air bag is provided with two parallel barrier strips; andthe two ends of each barrier