The utility model relates to a sedimentation type oil-gas well mouth ball catcher which comprises a cylinder body, wherein the cylinder body is provided with a flow inlet section and a flow outlet section, the flow inlet section is connected with an oil-gas collecting tree outlet, and a grate plate which separates the cylinder body into two portions is fixedly arranged on the inner wall of the cylinder body between the flow inlet section and the flow outlet section. A sedimentation cylinder which is perpendicularly communicated with the cylinder body extends in a radial mode and is arranged one side, close to the flow inlet section, of the root of the grate plate, and a plugging structure which is detachably connected is arranged at one end, away from the cylinder body, of a sedimentation cylinder. The sedimentation type oil-gas well mouth ball catcher is simple in structure. A ball can be caught without the need for dismantling a pipeline after completion of fracture, the sedimentation cylinder and the cylinder body are perpendicularly arranged, a circulation channel is not blocked when the ball is caught, an end cap is opened, the ball can be taken out, the pipeline does not need dismantling, working period is shortened, and working efficiency is improved.