The utility model is a single layer insulated pipeline structure for seabed transmission of oil, natural gas and water or mixed transmission for oil, gas and water. The utility model comprises a steel pipe transmission for the first layer, also an anticorrosive surface coating of transmitting steel pipe for the second layer, a heat preservation surface covering layer with an anticorrosive coating as the third layer, the fourth layer consists of a polythene protective pipe which is covered on the surface with heat preservation layer and finally a concrete layer covered on the surface of polythene protective pipe as the fifth layer, the above are layers are in close with each other, resulting in a complex pipeline as a whole. A water stopping end cap formed as ladder arranged at the end of the pipe. Most work for the pipes have been prefabricated in the land workshop, only welding the inner layer of transmitting steel pipe upon the arrival on site at sea, the utility model, substantially reducing working time at sea and speeding up construction on site, meanwhile, reducing cost and raise efficiency as well.