The invention relates to the technical field of tunnel building, and particularly relates to a closed pre-support tunnel structure. The closed pre-support tunnel structure comprises an annular pipe curtain structure which surrounds the outer side of a to-be-excavated tunnel limit; and the pipe curtain structure comprises a plurality of steel pipes which are distributed along the axis of a tunnel, the plurality of steel pipes are distributed along the circumferential direction of the tunnel at intervals and surround the outer side of the tunnel to form an annular structure, and the adjacent steel pipes are connected with through a steel plate to form a closed annular pre-support structure. According to the closed pre-support tunnel structure, the structure is simple, the construction is convenient, the stable tunnel excavating pre-support can be formed, the closed pre-support tunnel structure is beneficial to the rapid excavation of the tunnel, secondary lining is not needed, the construction cost is lowered, and the closed pre-support tunnel structure has great promotion values.