The invention discloses a switch assembly of an urban rail vehicle sliding door. The switch assembly of the urban rail vehicle sliding door comprises a microswitch, an installation base board, a swing arm, a rotation shaft, a torsion spring, a stop pin and an idler wheel. The switch assembly of the urban rail vehicle sliding door swings under the impact of a switch impacting block of the sliding door, a switch cantilever falls down, the microswitch acts, and a door in-place signal or a lock in-place signal is sent out. In a reset state, the switch impacting block is disengaged, the cantilever resets through the torsion spring, the switch cantilever is lifted, and the microswitch recovers to an initial state. According to the switch assembly of the urban rail vehicle sliding door, a complicated stretchy guiding rod part is removed, the structure is simplified, hidden danger caused by the clamping phenomenon generated by the spring is removed, and the torsion spring replaces a compression spring to be reset, so that an line of action of force is identical with the movement track of a stressed object. The switch assembly of the urban rail vehicle sliding door has the advantages of being high in reliability, long in service life, novel in structure, ingenious in design and good in application prospect.