The invention discloses a manipulator pull-down quick vehicle release device, and relates to a vehicle suspension vibration damping test system. The device is designed for realizing quick drop of a vehicle. The device consists of a positioning device (A), a pull-down device (B) and a quick release device (C), wherein the positioning device (A) mainly consists of a cast iron platform (a), an L-shaped supporting bent plate (b) and a balance spring (c); the pull-down device (B) mainly consists of a hydraulic cylinder support (d), a hollow piston pull-down hydraulic cylinder (e), a small round nut (f), a spoke type force transducer (g), a displacement transducer (h) and a balance cylinder bent plate (i); and the quick release device (C) mainly consists of a mechanical finger hydraulic cylinder (j), a mechanical finger stop block (k), a manipulator assembly (m) and a clamp assembly (n). The device provided by the invention can quickly, conveniently and reliably test the vibration damping performance of a rail vehicle suspension.