A manufacturing process of a screwdriver bit comprises the major steps that firstly, materials are prepared, namely, a bar with a certain length is prepared, the bar is provided with opposite side portions and abutting faces, the abutting faces formed by the side portions can abut against two or more corresponding faces of a hexagonal hole of an ordinary tool to be connected, the distance between the abutting faces is X1, the distance between the opposite side portions is Y1, and X1>=1.2*Y1; secondly, use ends are formed on two sides, specifically, the use ends are formed on the two sides of the bar through milling, the use ends can be used for driving various tools, and the middle portion, without being machined, of the bar is an assembling and connecting part; and thirdly, a finished product is obtained, specifically, a screwdriver bit body is obtained by means of the manufacturing process, and the manufacturing process efficacy can be achieved.