The invention relates to the field of intelligent detection robots, in particular to a rail suspension intelligent inspection robot system. The rail suspension intelligent inspection robot system comprises a V groove rail, a walking trolley, a lifting mechanism and a camera shooting rotating pan tilt; a trolley conductor and a synchronous tooth belt are arranged on the two sides of the V groove rail correspondingly, the walking trolley comprises a rotating hanging frame, a walking synchronous wheel, a swing sliding table, an ejector rod reset mechanism, a walking trolley stepping servo motor,a walking trolley upper base plate, a walking trolley lower base plate and a connecting rod, the lifting mechanism is composed of a lifting mechanism stepping servo motor, a first worm, a worm supporting frame, a first worm gear, a screw transmission shaft, a multi-stage screw, a screw nut, a fixed guide rod, and a guide telescopic rod, the camera shooting rotating pan tilt is composed of a pan tilt body, a camera rotating mechanism, and a pan tilt rotating mechanism, and the camera rotating mechanism comprises a camera rotating shaft, a rotating shaft bearing base, a third worm gear, a thirdworm, a worm supporting frame and a camera rotating stepping servo motor.