Shield originating or receiving end tunnel portal maintenance process

The invention belongs to the technical field of subway tunnel engineering, particularly relates to a shield end tunnel portal maintenance process, and provides an economic, safe and quick method. A tunnel portal maintenance structure during originating and receiving a shield can prevent water and play a role in maintaining a soil body and is easy to remove. The process comprises the following steps of: during shield end tunnel portal maintenance wall construction, inserting a steel sheet pile into a tunnel portal position; moving the steel sheet pile up and down before initial setting of maintenance wall concrete; and when the shield is originated or received and the front end of the shield is jacked to the steel sheet pile, pulling up the steel sheet pile, and impelling the shield to finish originating or receiving. The process is simple and easy to operate, and has low manufacturing cost; and the steel sheet pile can be reused, so the process has particularly predominant economic benefit and social benefit, significance and extremely high popularization value at modern stage of vigorously building subway traffic engineering.