Desilting method for deposits in horizontal advanced grouting filling hole in limited space

The invention provides a desilting method for silts in a limited space horizontal advanced grouting filling hole, which comprises the following steps: settling the silts in the hole, burying a water conduit, hanging a net, spraying C20 concrete, retreating grouting, pipe bundle grouting, verifying the effect, desilting and the like, and is characterized in that the precondition is that a primary support of a formed hole section is not damaged or is slightly damaged except for a sudden inrush position. The desilting method comprises the following steps of: arranging the silts in the hole, burying the water conduit, hanging the net, spraying C20 concrete, retreating grouting, pipe bundle grouting, verifying the effect, desilting and the like; according to the method, a drilling machine drills to the inrush position and retreats to conduct grouting to initially stabilize the in-hole deposits in a certain range in the hole, then a small guide pipe with a grout overflow hole in the front end is drilled to conduct