The invention discloses a water filter for a touring car employing inertia. The water filter comprises an annular sliding rail arranged at the top in a compartment, wherein the annular sliding rail is provided with a filter; a filter layer is arranged in the filter; a space in the filter is separated by the filter layer; a gland device is arranged in a sewage release area; a pull wire is arranged between the top of the filter layer and the top of the gland device; and a gap exists between the filter layer and the gland device. Compared with the prior art, the water filter for the touring car employing inertia has the advantage that penetration and filtration of water on the filter layer are accelerated by using the inertia of the touring car to form pressurized and accelerated filtration, so that the water filter is more energy-saving and environment-friendly.