Aiming at the problem that precision, efficiency, security and cost could not be balanced with existing inertial parameters measurement methods of powertrain, a fast integration system for measuring inertial parameters was designed. All the inertial parameters can be measured by this system in one installation and less than 90 min. A small sloping angle method was proposed to ensure the measurement security of products in comparison with traditional vertical, side lying and suspensory installation method. The actual measurement results of standard specimen show that the relative error of mass measurement is 0.024%, the maximum absolute error of centroid measurement is -0.2 mm, the maximum relative error of moment of inertia measurement is 0.91%, the maximum deviation of orientation angles of principal inertia axis is -1.79°.The comparisons with 4 common measurement methods show that the measurement precision is improved significantly, the efficiency and security is higher, and the cost is moderate. This system can easily be applied in real application and adapted in multiple products’ inertia parameters measurement.