Deep foundation pit anchor cable hole forming under high-water-level mudstone geological condition and hole forming process

The invention belongs to the technical field of anchor cable hole forming, and particularly relates to a deep foundation pit anchor cable hole forming and hole forming process under the high-water-level mudstone geological condition, which comprises an anchor cable hole formed in the high-water-level mudstone ground, a drill bit, a suction feeding pipe, a prestressed steel cable, an external thread connecting plate and an external baffle, the hole forming process for deep foundation pit anchor cable hole forming under the high-water-level mudstone geological condition comprises the following specific steps that the depth of a drilled anchor cable hole is larger than the length of a prestressed steel cable and the length of a suction feeding pipe; the steel cable and the suction feeding pipe are inserted into the drill bit through the drill rod, the drill bit and the drill rod are separated, then the suction feeding pipe and the drill bit are connected and fixed, in the using process, due to the arrangement of