The 4-in-1 centralized detection line consists of a single-board sideslip detection platform, a suspension device, a detection platform and a braking detection platform, which can detect sideslip, suspension, axle load and braking performance in a centralized way. The automatic four-in-one detection line can detect the maximum braking force, braking process curve, braking force and braking process difference, wheel braking force, wheel weight, suspension vibration curve and side slip. And automatically print and save the test results.