Positioning apparatus applied on equipment with one or a plurality of single axles is fixed on two bases opposite to each other. Adjusting device is located in each base and corresponding to each cross or single axle, which is configured for adjusting the position of the cross or single axle in a direction parallel to the base. Fixing device is configured for fixing the adjusting device on the base. The fixing device is moved in one direction vertical to the adjusting device adjusted in another direction.