Railway signal device power source based on double-bus power supply

The invention discloses a railway signal device power source based on double-bus power supply. The device power source comprises a first power source supply circuit and a second power source supply circuit. The first power source supply circuit comprises at least one pair of uninterruptible power source bodies, a bus and a converting module, and the second power source supply circuit comprises at least one pair of uninterruptible power source bodies, a bus and a converting module. The input ends of the uninterruptible power source bodies are connected with a mains supply. The output ends of the uninterruptible power source bodies are connected with the buses in the corresponding power source supply circuit. The buses of the two power source supply circuits are connected with external railway signal devices respectively through the corresponding converting modules. The first power source supply circuit and the second power source supply circuit are independent from each other and isolated physically. According to the technical scheme, when the short circuit of a 50HZ alternating current equipment with power supplied by any power source supply circuit occurs, or the short circuit of the uninterruptible power source body or the converting module of any power source supply circuit occurs, only one power source supply circuit is influenced without influencing the other power source supply circuit, and therefore normal work of the metro signal devices is not influenced.