The invention discloses a concrete structure of an in-situ protective large-diameter oil-gas pipeline and a construction method. The construction method specifically comprises the steps of pipeline position exploration and excavation, accompanying optical cable relocation and transformation, steel sheet pile protection, protection culvert construction, alternating current interference protection construction and reinforcement of foundations on the two sides of a protection culvert. According to the concrete structure of the in-situ protective large-diameter oil-gas pipeline, large-diameter oil-gas pipeline relocation and transformation are avoided during roadbed construction, the influence of construction on pipeline operation is reduced, the pipeline operation safety during construction is ensured, the influence of highway and railway operation on the pipeline is solved, later maintenance is facilitated, a large settlement difference between the roadbed and the protection culvert can be avoided, the stability of the roadbed is ensured, and the project progress is accelerated; and under the regulation and control of the national coal-to-gas energy policy, the in-situ protective oil-gas pipeline is adopted, so that it is ensured that a valve is not closed, pressure is not reduced, and conveying is not stopped, and the concrete structure plays a very important role in relieving national energy supply shortage and promoting environmental governance.