A combined spring compensation suspension device for a vehicle includes a free spring, a compensation spring, a compensation spring pre-tightening device, a vibration isolation block, a light damping shock absorber and a guide mechanism. The compensation spring pre-tightening device is installed at an upper end of the compensation spring. The guide mechanism is used to connect a wheel with a vehicle body. An elastic element on the suspension device of the vehicle is composed of the free spring and the compensation spring. A suspension load has a compensation interval nearby a static deflection stroke of a suspension. When the suspension load is changed in the compensation interval, the stroke is not changed or is slightly changed. Only when the suspension load exceeds the compensation interval, the suspension stroke can be changed. Controllability and comfort of the vehicle adopting the design can be simultaneously improved.