The invention discloses a wire harness structure design of "2 arrival and departure tracks and 1 locomotive running track between the 2 arrival and departure tracks " in heavy haul railway marshalling yard. The structure is adapted to transport organization characteristics of a heavy haul railway and meets the requirements that a 20,000t long train set can be combined by 5000t trains and 10000t trains or a 20,000t long train set can be divided into 5000t and 10000t short train sets. The harness structure design disclosed by the invention comprises setting of operating procedures and operating time, wire harness structure, quantity of wire harnesses and middle switches, and arrangement of wire harness spacing of a heavy haul train marshalling yard. The structure consists of two 2800m-long arrival and departure tracks, one locomotive running track and three groups of middle switches. The structure not only meets the train change requirement that a locomotive needs to be on one side of one of the arrival and departure track, but also is used as a safe parallel receiving route of short train sets; a wire harness which consists of two arrival and departure tracks and one locomotive running track, namely, a simple wire harness structure layout of "2arrival and departure tracks and 1 locomotive running track between the 2 arrival and departure tracks " is formed. The wire harness structure design of "2 arrival and departure tracks and 1 locomotive running track between the 2 arrival and departure tracks " in a heavy haul railway marshalling yard disclosed by the invention is simple in structure, simultaneously meets the two operating requirements for receiving, sending and marshalling trains, further enriches and improves the heavy haul railway transport stream organization and improves the transport capacity and efficiency of the heavy haul railway.