The invention relates to an urban railway operating vehicle and particularly relates to a straddle type single-track operating vehicle with a four-wheel-pair structure. The problems of heavy carriage, complex driving mode, low driving efficiency, heavy bogie, and the like, of the present operating vehicle are solved. The straddle type single-track operating vehicle comprises a carriage, a front bogie, a rear bogie, an I position wheel pair, an II position wheel pair, an III position wheel pair and an IV position wheel pair, wherein each bogie comprises a frame, a vehicle body supporting device and a dragging device; the whole frame has an II-shaped all-steel welded plate type box structure and comprises a lateral beam, an end beam, a central beam and a longitudinal beam; a motor bracket is fixed between the upper part of the lateral beam and the longitudinal beam; the I position wheel pair and the II position wheel pair are mounted on the motor bracket of the rear bogie; the III position wheel pair and the IV position wheel pair are mounted on the motor bracket of the front bogie; a guide wheel assembly is mounted in the middle of the lateral beam; a stable wheel assembly is mounted on the lower part of the lateral beam. The line demand on a single rail PC beam is reasonably met; the safety factor is high; the traction performance is excellent; the structure is simple; the repairing is easy; the vehicle running is stable; the braking performance is excellent.