The invention provides an arbitration system of vehicle-mounted train control equipment, and belongs to the technical field of the safety control of railways and solving the problem of incapability of ensuring the correctness and safety of the output quantities of the safety computer because calculated results are only arbitrated, but output quantities of respective passageways of a computer are not arbitrated in the traditional redundant safety computer system. The arbitration system comprises an arbitration module used for arbitrating the output quantities of two computers in the redundant safety computer system respectively and outputting the output quantities when the output quantities of the two computers are the same, wherein the output quantities of the two computers comprise the output quantity of an I/O (Input/Output) port and the output quantity of a communication port. In the invention, as the output quantities of the I/O port and the communication port of the computers are arbitrated, the correctness and safety of the output quantities of the safety computers are ensured.