The invention provides a wheel-leg hybrid hexapod robot. The robot comprises a vehicle frame, a brake system and six wheel sets; the brake system comprises a motor, a brake movement mechanism and a brake pump; the brake movement mechanism comprises a fixed frame and a transmission mechanism; the transmission mechanism comprises a screw rod transmission mechanism and a transmission guide mechanism;each wheel set comprises a wheel train, a wheel train steering system, a gait motion system and an H rod system; each wheel train steering system comprises a servo motor, a fixing seat, a fastening plate, a first short shaft, a coupler, a second short shaft, an upper bow plate, a lower bow plate and a bearing seat; each gait motion system comprises a gait adjusting structure and a buffering structure; each gait adjusting structure comprises a push rod motor, a rotating connecting plate, an upper rotating plate, a lower rotating plate, a push rod support, a rotating shaft, a bearing seat and afixing plate; and each buffering structure comprises a supporting frame, a damping fork, an upper connector, a lower connector, a buffering connector, an upper connecting rod, an H connecting rod, adamper and a limiting strip. According to the invention, the robot can be used for highly difficult operation such as investigation and rescue.