The invention discloses an inertia adjustment urban subway seat which comprises a seat body, supporting seats and sliding rods. The two sliding rods are arranged in parallel. The supporting seats are arranged at the bottom of the seat body. Each sliding rod comprises a straight line segment and arc segments arranged at the two ends of the straight line segment. Idler wheels are arranged in each sliding rod. Grooves matched with the idler wheels are formed in the inner wall of each sliding rod. Strip-shaped holes are formed in the arc segments at the two ends of each sliding rod and extend to the corresponding straight line segment. Each idler wheel is provided with a rotary shaft and extends out through the strip-shaped holes in the two sides of the corresponding sliding rod. Each supporting seat is fixedly connected with the corresponding rotary shaft. By the adoption of the inertia adjustment urban subway seat, a subway passenger cannot slide on the seat when a train accelerates to leave a station or decelerates to enter the station, and the passenger does not need to change the sitting posture to provide the same acceleration as the train for the whole body either.