The invention discloses a multifunctional screwdriver capable of regenerating a straight groove on a screw. The multifunctional screwdriver comprises a screwdriver handle and a screwdriver rod with the tail arranged in the screwdriver handle, a straight screwdriver head is arranged at the head of the screwdriver rod, and a saw blade corresponding to the screwdriver head in thickness is arranged on one side of the screwdriver rod. By arranging the saw blade on the screwdriver rod, when an original straight groove or a cross groove is worn, the straight groove can be formed by sawing for screwing-out of the screw.