Elastic support device, dynamic compactor lifting device and dynamic compactor

The invention provides an elastic support device comprising a support frame. First elastic components used for abutting against the support frame are arranged under the support frame. When the elastic support device is used, the support frame of the elastic support device can support proper positions of a cylinder barrel of an oil cylinder; and when acting force vertical to the length direction of the oil cylinder is exerted on the oil cylinder, the cylinder barrel transmits the acting force to the elastic support device, and then the first elastic components of the elastic support device are stressed to exert counter-acting force to the cylinder barrel, so that magnitude of external force exerted on the oil cylinder can be effectively reduced and negative influences brought by vibration and impact are weakened finally. Therefore, with the elastic support device, force condition of the oil cylinder can be effectively improved to prolong the service life of the oil cylinder. In addition, the invention further provides a dynamic compactor lifting device and a dynamic compactor both with the elastic support device.