Plastic alloy synthetic telecommunication pipe is made of multiple macromolecular materials ,after the meshwork alloying treatment and structural design based on dynamo principles, it will be casted the shape of rectangle outside but round inside for one time. It can replace steel pipe as the protection of underground information cables crossing roads and thus cuts costs substantially. It is widely used for the pipelines of Internet, mobile telephone network, telephone network, radio and TV network as well as all other networks where optical or power cables are used.