The invention relates to a treatment method of a sinkhole in a karst landform road roadbed range. The treatment method of the sinkhole comprises the following steps: (1) pumping water and dischargingsewage to lower a water level in a sinkhole; (2) uniformly dispensing gravels along the sinkhole, tamping and squeezing the gravels into sludge; (3) after the gravels are dispensed to a designed standard height, pouring the concrete until the gravels are completely covered, and tamping and compacting; (4) pouring the gravel concrete to a cover plate bottom until reaching a designed standard height; (5) after the gravel concrete layer is solidified, flattening the field, constructing a reinforced concrete ribbed cover plate, and arranging a leveling layer between the cover plate and the gravelconcrete layer; (6) removing slope humus, wherein the slope on two sides is required to meet the design requirement; and (7) layering grinding, and refilling the roadbed to a designed standard height.By adopting the treatment method, the sinkhole in the roadbed range of the karst landform area can be effectively treated, and the problems of the underground water for the roadbed soil such as soaking, erosion, roadbed softening, loss and the like can be effectively solved.