The cap screwing part will screw the cap arranged by the cap sorting device to the bottle with the product already filled, and send it to the subsequent process by the conveyor chain. The capping machine drives the turntable to rotate through the reducer. Make the lid leave the hopper from the lid outlet under the action of centrifugal force. There is a front and back cover separating device at the exit. When the back cover passes by, the cover automatically falls into the return pipe, and the back cover is automatically blown into the hopper by wind. Only the front cover can enter the chute smoothly. The amount of cover in the hopper is automatically detected by the photoelectric switch to control the cover conveying machine to ensure that the lower cover achieves the desired effect. When the front cover enters the slideway, you can smoothly enter the cover feeding tray. In order to prevent accidents, an anti-reverse cover dial is also configured on the slideway to ensure that the cover that enters the feeding cover tray is correct. A pair of slides are also provided The photoelectric switch, when it detects that there is no cover, it stops the host immediately. In order to effectively remove the broken cover without the anti-theft ring and clean the remaining cover of the hopper, there is a movable outlet directly opposite the hopper outlet to meet this function.