Orifice sealing device and method for drilling construction

The embodiment of the invention discloses an orifice sealing device and method for drilling construction, relates to the technical field of coal mine gas treatment, and can effectively improve the sealing effect of an orifice during drilling construction. The device comprises a body, a sealing cover, a first sealing piece, a second sealing piece and a first pipe fitting, wherein the body is provided with a separation cavity, and a first hole body, a second hole body, a third hole body and a fourth hole body which are communicated with the separation cavity; the sealing cover is connected to the first hole body, a blocking cavity is formed between the sealing cover and the body, and the first sealing piece is arranged in the blocking cavity; the second sealing piece is arranged on the side, away from the first sealing piece, of the sealing cover. The first end of the first pipe fitting is configured to be adaptively connected with the second hole body; the second sealing piece, the sealing cover, the first sea