Pressured water supply pipe hole opening and pipe connecting device and pipe connecting method thereof

The invention discloses a pressured water supply pipe hole opening and pipe connecting device and a pipe connecting method thereof, and belongs to the field of water pipe connection. The pressured water supply pipe hole opening and pipe connecting device comprises a drill rod, a first drill rod locating plate, a first protective cylinder, a second drill rod locating plate, a first flange piece, asecond flange piece, a second protective cylinder and a hole opener. The two drill rod positioning steel plates are arranged at the middle of the hole opening device, so that the linear advancing state of the hole opener can be kept in the working process, and the accuracy of the hole opening position is guaranteed; the drill rod locating steel plates can block water flow, the inner pressure and the outer pressure balance of the device can be maintained, and a large amount of water can be prevented from overflowing; meanwhile, the pipe connection operation can be carried out in a water-containing environment, water su