Automatic cap screwing device

The utility model discloses an automatic cap screwing device which comprises a first transferring mechanism, a second transferring mechanism and an operation table arranged between the first transferring mechanism and the second transferring mechanism, a screwing mechanism is arranged above the operation table, a clamping assembly corresponding to the screwing mechanism is arranged on the operation table, a first proximity sensor electrically connected with the clamping assembly is arranged beside the clamping assembly, and a second proximity sensor electrically connected with the clamping assembly is arranged beside the first proximity sensor. The first proximity sensor is electrically connected with the screwing mechanism, after the first proximity sensor senses an object to be subjected to cap screwing, the clamping assembly is matched with the bottom of the object to be subjected to cap screwing in a clamping mode, the screwing mechanism screws the object to be subjected to cap screwing, and therefore the