The utility model relates to the technical field of electrical control over rail transit shielded gates, in particular to an uninterruptible power supply device for rail transit shielded gate system. The uninterruptible power supply device for rail transit shielded gate system comprises a mains supply input bus, an AC 220V bus, a DC 24V bus and a DC 110V bus, and further comprises a ZL rectifier module, an NB inverter module, a KG switching power supply module, a JT static electronic switching device and a DN electric energy storage unit. According to the uninterruptible power supply device for rail transit shielded gate system, failure situations are few, fault points are few, only one single-point failure point of a battery exists, and the battery single-point failure point can be eliminated through a dual-battery backup. Under normal circumstances, the alternating current supply power and does not need conversion, and the direct current needs AC/DC first-level power conversion, so that investment is small, and safety coefficient is high. The battery directly supplies power to DC 110V, no conversion step is needed, and the battery backup is more reliable.