An apparatus (100, 200) for automated nondestructive inspection of a metal structure having a surface, the apparatus comprising: an ultrasonic nondestructive inspection unit, a nondestructive inspection unit based on magnetic flux leakage method an eddy-current nondestructive inspection unit, a control unit connected to the ultrasonic nondestructive inspection unit, the nondestructive inspection unit based on magnetic flux leakage method and the eddy-current nondestructive inspection unit and configured for sending control signals to carry out inspection of the metal structure, and a navigation unit connected to the control unit, wherein the navigation unit is configured to determine a position of said apparatus for automated nondestructive inspection relative to the metal structure, to determine a state of the surface of the metal structure and to send signals into the control unit with information about the position of said apparatus and the state of the surface of the metal structure to be inspected, wherein all said units are installed in a housing, the housing comprising a means for moving said apparatus for automated nondestructive inspection over the surface of the metal structure to be inspected, the control unit is configured to send the control signals simultaneously to at least one of the ultrasonic nondestructive inspection unit, the nondestructive inspection unit based on the magnetic flux leakage method and the eddy-current nondestructive inspection unit based on the signals received from the navigation unit, the nondestructive inspection unit based on the magnetic flux leakage method is configured to change a magnetic field induction generated by this unit from a minimum value close to zero value to a predetermined maximum value, the nondestructive inspection unit based on magnetic flux leakage method comprises a magnetic system comprising two magnetic drums connected by a U-shaped flux guide frame comprising two parallel pole pieces being distal parts of said U-shaped flux guide frame, and wherein said two magnetic drums are positioned at the two pole pieces, said two magnetic drums completely fill in cross-sections of the two pole pieces, said two magnetic drums are magnetized diametrically with a rotation axis directed perpendicular to a plane of the U-shaped flux guide frame, and said two magnetic drums are configured to rotate with respect to each other. an ultrasonic nondestructive inspection unit, a nondestructive inspection unit based on magnetic flux leakage method an eddy-current nondestructive inspection unit, a control unit connected to the ultrasonic nondestructive inspection unit, the nondestructive inspection unit based on magnetic flux leakage method and the eddy-current nondestructive inspection unit and configured for sending control signals to carry out inspection of the metal structure, and a navigation unit connected to the control unit, wherein the navigation unit is configured to determine a position of said apparatus for automated nondestructive inspection relative to the metal structure, to determine a state of the surface of the metal structure and to send signals into the control unit with information about the position of said apparatus and the state of the surface of the metal structure to be inspected, wherein all said units are installed in a housing, the housing comprising a means for moving said apparatus for automated nondestructive inspection over the surface of the metal structure to be inspected, the control unit is configured to send the control signals simultaneously to at least one of the ultrasonic nondestructive inspection unit, the nondestructive inspection unit based on the magnetic flux leakage method and the eddy-current nondestructive inspection unit based on the signals received from the navigation unit, the nondestructive inspection unit based on the magnetic flux leakage method is configured to change a magnetic field induction generated by this unit from a minimum value close to zero value to a predetermined maximum value, the nondestructive inspection unit based on magnetic flux leakage method comprises a magnetic system comprising two magnetic drums connected by a U-shaped flux guide frame comprising two parallel pole pieces being distal parts of said U-shaped flux guide frame, and wherein said two magnetic drums are positioned at the two pole pieces, said two magnetic drums completely fill in cross-sections of the two pole pieces, said two magnetic drums are magnetized diametrically with a rotation axis directed perpendicular to a plane of the U-shaped flux guide frame, and said two magnetic drums are configured to rotate with respect to each other.