Plastic hose coupling

The utility model discloses a connecting device for a plastic flexible pipe, which is characterized in that the utility model is provided with a pair of inner interfaces 1 and a butting sleeve 3 which is matched with the inner interfaces 1. A group of sealing rings 2 is arranged on the matching point of both ends of the inner interfaces 1 and the end opening of the butting sleeve 3. Square holes 5 are arranged on the outer walls of the inner interfaces 1. The square holes 5 are matched with a locking pin 4 of an I-shaped cross section. The butting sleeve 3 is fixed by the square holes 5. The utility model is especially suitable for serving as a joint of a conveying water pipe in the course of irrigation in soil lands which are contracted in the existing wide countryside in China, with the advantages of simple structure, convenient connection and operation, land saving, and water saving.