An improved through type screwdriver is provided, wherein, the back end of the screwdriver grab handle is fixedly provided with a step-shaped metal joint; the small diameter end at the front end of the metal joint is provided with a hexagonal hole in jamming connection with the rod body of a screwdriver rod; the big diameter end at the back end is a knock part of which the top surface is provided with an angle hole. Therefore, when the utility model is used on the bolts difficult to be dismantled, the knock part at the back end of the screwdriver grab handle can be used for tool, and the angle hole on the top surface of the knock part is capped the tools such as a hexangular wrench to increase the modes of rotation force arm, so as to achieve the objective of being convenient to rotate, operate and dismantle bolts.