The invention provides an automatic screw machine which comprises a base plate and a screw locking device arranged on the base plate, wherein a conveying mechanism and a vacuum adsorption mechanism are arranged behind the screw locking device; the conveying mechanism comprises a pipe frame perpendicular to the base plate; a group of chip pipes are arranged in the pipe frame in a laminated manner; the chip pipe at the bottommost position is a working pipe through which an elastic push piece penetrates; a retaining block is arranged at the foremost end of each chip pipe and comprises an accommodating part fitted to a chip and a baffle positioned at the foremost end; and the distance from the accommodating part to the base plate is equal to the distance from the chip in each chip pipe to the base plate. The automatic screw machine has the main beneficial effects that due to the arrangement of the accommodating part of each retaining block, each chip pipe can accommodate one chip all the time, and the chip cannot move when the elastic push piece is retracted; and therefore, the adsorption position of a vacuum adsorption device is guaranteed, and the production pass rate is increased.