The invention relates to a drilling process for surveying a land pebble-filled limestone cave. Different from a traditional process, the drilling process for surveying the land pebble-filled limestonecave comprises the process steps of (a) measuring a hole position, then adopting a first drilling tool to start drilling, and protecting a wall for a hole drilled at the upper end of a rock base plane after drilling to the rock base plane; (b) then drilling a limestone cave layer top plate surface, cleaning the hole to be below a limestone cave layer bottom plate surface, then lift-drilling, andrecording the distance between the limestone cave layer top plate surface and the limestone cave layer bottom plate surface; (c) configuring a core barrel with a drill bit according to the distance instep (b) so as to form a second drilling tool, then using the second drilling tool to drill the limestone cave layer bottom plate surface, and keeping the core barrel with the drill bit in the drilled hole so as to protect the wall, wherein the wall protecting range is at least from the limestone cave layer top plate surface to the limestone cave layer bottom plate surface; (d) adopting a third drilling tool with the diameter being smaller than the inner diameter of the core barrel for drilling and coring in the core barrel to a designed hole depth; and (f) after finishing drilling and coring, taking the core barrel out. The drilling process for surveying the land pebble-filled limestone cave involved in the invention has high construction efficiency.