Wellhead large-drift diameter continuous ball catcher and control method thereof

The present invention provides a wellhead large-drift diameter continuous ball catcher, comprising a cylindrical pipe section. A wellhead pipeline is connected to the right side of the pipe section. The pipe section tilts downwards by 10 to 15 degrees in a vertical direction of the wellhead pipeline. A safety plug valve, an isolating plug valve and a ball collecting plug valve are orderly disposed on the pipe section from right to left. A screen pipe is disposed within the pipe section between the safety plug valve and the isolating plug valve, and a plurality of overflowing holes are formed in the surface of the screen pipe. A left side of the ball collecting plug valve is connected to a discharge pipeline. An open flow pipeline is connected to the pipe section in the middle of the screen pipe. The wellhead large-drift diameter continuous ball catcher overcomes the defects in the prior art, and is reliable in principle, and simple in structure; the ball catching method is feasible; continuous and efficient t