The invention discloses a skateboard structure relative to different earthí»s surfaces. Wherein, the steering device mounted on the bottom of skateboard has a support device which has an elastic buffer main body for smoothing the bottom; said main body has a support part on which support rollers are mounted to make the support device own best support force and buffer safety both on the hard and soft ground; a adjusting device arranged between the skateboard and the steering device can adjust the position of support device to attain right space of support device and change the stability and flexibility of skateboard by adjusting the supported area.