A step conveyor contains a stationary frame mounted on the base, a mobile frame connected with the mechanism of lifting and displacement of mobile frame connected with the drive, and it contains the synchronizing control rod. On stationary and mobile frame, at a distance from each other, parallel horizontal guides are mounted in such a manner that the distance between the guides of stationary frame exceeds horizontal size of cross section of the guides of mobile frame, and the mechanism of lifting and displacement of mobile frame is executed in the form of two shafts mounted in parallel and connected by synchronizing control rod, on which with the help of the bearing support the mobile frame is mounted, and ends of which are connected with the fixed frame with possibility of rotating said shafts, and one of the ends of one of the shafts is connected with the drive of rotation, moreover, each end of each of the shafts contains two additional sections with cylindrical surfaces, and longitudinal axes of symmetry of each shaft and two sections belonging to one of its ends are parallel and located at a distance between them, and the sections of one end of each shaft being the mirror image of the sections of the second end of the shaft. Furthermore, synchronizing control rod is executed with ring-shaped ends connected with the appropriate cylindrical surfaces of shafts, which are not connected with mobile and stationary frames, the device additionally containing the orienting drum mounted above mobile frame in such a manner that its longitudinal axis of symmetry is located horizontally and perpendicular to the guides of mobile frame.