The utility model relates to a network structure based on rail transit, which comprises at least two first-level network systems used for overall network data transmission, and a second-level networksystems used for branch network data transmission are connected to each first-level network system through a first-level network nodes; the first-level network systems are connected in parallel through a first-level network nodes, and each first-level network node is connected with at least two second-level network systems. And the redundancy is high: the A/B network systems of the MVB bus are completely separated, and the MVB bus has a completely redundant MVB transmission line. Paralysis of the whole transmission network caused by faults of a single connector, loosening or cable faults and the like can be avoided; and the reliability is high: the wiring mode among the cable, the connector and the equipment is changed into parallel connection, the transmission interruption of the networksystem cannot be caused when any single-point fault occurs in the equipment, in addition, any branch network segment fault cannot influence other branch network segments and trunk network segments, and the influence of the single branch network segment fault on the whole network is reduced.