The invention discloses a wall-climbing robot, comprising a front body, a back body, a waist overturning mechanism and a control unit, support legs and walking legs are respectively arranged at the two sides of the front body and the back body, the support legs and the walking legs at the two sides are arranged at opposite angles, the wall-climbing robot is characterized in that: the waist overturning mechanism comprises a clutch, a front support and a back support fixed on the back body, a rotary shaft is fixed on the front support to penetrate the front body in a sliding manner, the other end of the rotary shaft is fixed at one end of the clutch, the other end of the clutch is fixed with the front body, front and back gears which are mutually meshed are fixed on the front and the back supports, wheel shafts of the front and the back gears are movably connected through a connecting plate, wherein, the a front body overturning stepping motor and a back body overturning stepping motor are respectively arranged on the front and the back supports, output shafts of the front body and the back body overturning stepping motors are respectively connected with the wheel shafts of the frontand the back gears, the front body, the back body overturning stepping motor and the clutch are respectively connected with the control unit.