The invention discloses a motor vehicle brake logic circuit. The motor vehicle brake logic circuit comprises a speed logic signal conversion chip, a distance logic signal conversion chip and a logic gate for generating a driving signal for driving a brake motor to brake. The invention further discloses a motor vehicle brake, and the motor vehicle brake comprises the logic circuit. The invention further discloses a braking method for a motor vehicle. The braking method for the motor vehicle comprises the following steps that 1, the speed of the motor vehicle is collected, and the obstacle distance is obtained; 2, a speed logic signal sequence and a distance logic signal sequence are generated; and 3, the driving signal is generated. A preset speed section and a preset distance section are preset, two pieces of data collected by speed collecting equipment and distance collecting equipment are compared with the corresponding preset section data, the speed logic signal sequence and the distance logic signal sequence are quickly obtained, the motor vehicle brake is driven to brake by the logic gate without program calculation, the reaction time difference caused by program calculation is reduced, the safety is higher, and a driver is assisted to avoid obstacles.