The embodiments of the present application relate to the technical field of signal processing, and provided a radar signal processing method, a radio signal processing method, and a device. The radar signal processing method includes: after an echo signal is mixed based on a local oscillator signal, and digital signal processing is performed to obtain a signal to be processed, the signal to be processed is subtracted based on a datum difference frequency signal to obtain a target signal, and a travelling speed of a target relative to a radar and/or a distance of the target relative to the radar is determined according to the target signal. Since the datum differential frequency signal is a signal obtained by mixing a leakage signal based on the local oscillator signal and performing the digital signal processing in a target free environment, that is, the datum differential frequency signal can represent information of the leakage signal in the actual measurement process. Therefore, subtracting the signal to be processed based on the datum differential frequency signal can effectively reduce the content of the leakage signal in the signal to be processed, reduce an impact of the leakage signal on the measurement result, thereby improving the accuracy of the measurement results.