The invention discloses a municipal pipe network system. The municipal pipe network system comprises a main pipe groove and a pipe shaft, wherein the main pipe groove comprises an oil and gas pipe groove, a blowdown pipe groove, a drinking water pipe groove and an electric power telecommunication pipe groove, the oil and gas pipe groove, the blowdown pipe groove, the drinking water pipe groove and the electric power telecommunication pipe groove are integrally formed and horizontally arranged in sequence, and each pipe groove further comprises a corresponding groove cover. An oil and gas isolating layer is laid on the inner wall of the oil and gas pipe groove, and a gap between each oil and gas pipe and the isolating layer is filled with a clay layer with the compaction degree of 97%; a sewage isolating layer is laid on the inner wall of the blowdown pipe groove, and a gap between a sewage pipe and the sewage isolating layer is filled with a sand soil layer; and the drinking water pipe groove and the electric power telecommunication pipe groove are each filled with a sand soil layer. Pipes of all departments are uniformly regulated and laid, the number of road surface shaft covers is decreased, circuits are synchronously laid, and accidental injuries to other pipes in the pipe repairing or laying process are prevented; and in addition, the oil and gas pipes are protected through the compacted clay layer, clay is exquisite in soil texture and good in sealing performance after being compacted, and leaked oil gas is prevented from making contact with air.