Positioning device and using method thereof

The invention provides a positioning device and a using method thereof. A plurality of main frame supports are arranged at intervals and supported on the ground, and a circle is defined by the main frame supports; the number of the cross beams is the same as that of the main frame supports, one end of each cross beam is connected with the top of the corresponding main frame support, the other ends of the cross beams converge towards the center point of a circle and are connected with one another, and the annular plate is placed on a plane formed by connecting the cross beams; the central disc is arranged above the central point of the circle; one plane steel plate is arranged at the top of the corresponding main frame support; one protruding bevel angle steel plate is arranged on the corresponding plane steel plate, and the protruding bevel angle steel plates are used for positioning the outer edge of the annular plate. The method can be used for solving the problems that the adjusted and positioned annular p