The utility model belongs to the technical field of machinery, and particularly relates to an improved spreading tool bit which comprises a shell, a displacement pull rod, a reset device and a slidingblock driven by the displacement pull rod, the sliding block and the reset device are arranged on the shell, a moving cavity is formed in the shell, and the displacement pull rod is located in the moving cavity. An inclined handle is arranged at the bottom end of the sliding block, the inclined handle is connected with the displacement pull rod through a first oil pipe, the bottom of the displacement pull rod is connected with a control system through a pipeline, and inlet, outlet and metering of oil can be controlled through the control system. The oil pipe is arranged between the displacement pull rod and the sliding block, the control system is arranged on one side of the displacement pull rod, and therefore timed, quantitative and continuous oil-gas lubrication is provided through thecontrol system. In addition, manual operation is changed into automatic operation, so that the labor consumption is reduced, the efficiency is high, and the oil injection amount is more accurate. Andmeanwhile, due to sufficient lubrication, abrasion of some parts caused by sliding of all the parts can be reduced, and the service life is prolonged.