The invention provides a vehicle mileage and velocity collecting device firstly. The vehicle mileage and velocity collecting device comprises an antiskid unit 3 and a mileage and velocity collector 8,wherein the antiskid unit 3 measures the rotating number of times of wheels, converts the rotating number into a velocity signal and transmits the velocity signal to the mileage and velocity collector 8; and the mileage and velocity collector 8 receives the velocity signal, calculates and records the velocity and millage information after correction of the velocity signal, and comprises a controlmodule unit capable of being provided with software for updating and data reading, a display output unit for displaying related information and performing corresponding software operation, and a calculating unit for calculating velocity and mileage. The invention further provides a vehicle mileage and velocity calculating method which adopts the device. The vehicle mileage and velocity collectingdevice and the calculating method provided by the invention can correct the velocity signal so as to accurately calculate the operating mileage and the operating velocity.