A road condition determining device, comprising: an obtaining module configured to obtain a wheel center vertical acceleration signal of each wheel of a vehicle; a preprocessing module disposed at a post-stage of the obtaining module and configured to preprocess each of the wheel center vertical acceleration signal to obtain an initial determining signal capable of characterizing a fluctuation of the wheel center vertical acceleration signal; a high-pass filter disposed at a post-stage of the preprocessing module and configured to perform high-pass filtering on the initial determining signal by using a high-pass filtering factor; a low-pass filter disposed at a post-stage of the preprocessing module in parallel with the high-pass filter and configured to perform low-pass filtering on the initial determining signal by using a low-pass filtering factor; and a determining module configured to determine a road condition coefficient based on an initial determining signal obtained after low-pass filtering and an initial determining signal obtained after high-pass filtering; the determining module comprises an analysis submodule and a coefficient determining submodule, wherein the analysis submodule is configured to obtain, through Fourier analysis, a first amplitude and a first frequency of the initial determining signal obtained after high-pass filtering and a second amplitude and a second frequency of the initial determining signal obtained after low-pass filtering; and the coefficient determining submodule is configured to determine the road condition coefficient based on the first amplitude, the first frequency, the second amplitude, and the second frequency. an obtaining module configured to obtain a wheel center vertical acceleration signal of each wheel of a vehicle; a preprocessing module disposed at a post-stage of the obtaining module and configured to preprocess each of the wheel center vertical acceleration signal to obtain an initial determining signal capable of characterizing a fluctuation of the wheel center vertical acceleration signal; a high-pass filter disposed at a post-stage of the preprocessing module and configured to perform high-pass filtering on the initial determining signal by using a high-pass filtering factor; a low-pass filter disposed at a post-stage of the preprocessing module in parallel with the high-pass filter and configured to perform low-pass filtering on the initial determining signal by using a low-pass filtering factor; and a determining module configured to determine a road condition coefficient based on an initial determining signal obtained after low-pass filtering and an initial determining signal obtained after high-pass filtering; the determining module comprises an analysis submodule and a coefficient determining submodule, wherein the analysis submodule is configured to obtain, through Fourier analysis, a first amplitude and a first frequency of the initial determining signal obtained after high-pass filtering and a second amplitude and a second frequency of the initial determining signal obtained after low-pass filtering; and the coefficient determining submodule is configured to determine the road condition coefficient based on the first amplitude, the first frequency, the second amplitude, and the second frequency.