Wellhead device for non-pressure oil well annulus testing

The utility model relates to a wellhead device for annulus testing of a non-pressure oil well. Wellhead eccentric large flange, a central blind plate of the wellhead eccentric large flange is providedwith an eccentric measuring hole and is connected with an eccentric oil pipe; a plurality of eccentric large flange bolt holes are evenly distributed in the periphery of the wellhead eccentric largeflange, a pulley block for testing is fixed to the eccentric large flange bolt hole close to the eccentric measuring hole and comprises an L-shaped support, a top pulley and a bottom pulley, the top pulley is installed at the top of a vertical arm of the L-shaped support, and the bottom pulley is installed at the tail end of a cross arm of the L-shaped support; and a logging cable sequentially bypasses the ground pulley and the top pulley, vertically and downwards penetrates through the eccentric measuring hole and is connected with a downhole instrument string. A support bolt hole is formed in the root of a cross arm