The invention provides a sand-burying workover technology for coal-bed gas horizontal wellbore caves. The sand-burying workover technology includes putting a protective sleeve, a sand bailing nib, a tail pipe, a sand bailing pump and an oil pipe down into an original well sequentially, turning on the sand bailing pump to remove fracturing sand in the original well, and putting a first gauge cutterdown into the top of one cave; taking the first gauge cutter out, putting a screened pipe, a release and tubing down into the cave, recording an initial position of the screened pipe, taking out of the tubing, putting a tricone bit, a helicoid hydraulic motor and the tubing down into the cave, and making the tricone bit go down to the bottom of the initial position of the screened pipe; drillingby controlling the tricone bit and the helicoid hydraulic motor until the tricone bit drills into an artificial bottom of the well; putting a second gauge cutter down into the artificial bottom of thewell, and flushing the sand bailing nib and the tubing after they are placed down into the artificial bottom of the well. The sand-burying workover technology for coal-bed gas horizontal wellbore caves has the advantage that the helicoid hydraulic motor in a slotted liner assists in drilling workover operation to ensure the integrity of a wellbore, so that coal bead collapse in a sand-burying workover process is effectively prevented.