The invention relates to the technical field of water meter cap screwing, in particular to an automatic cap screwing device for water meter production. Comprising a rack, a meter cover mounting mechanism, a bearing seat and a glass mounting mechanism, the meter cover mounting mechanism, the bearing seat and the glass mounting mechanism are mounted on the rack, a meter cover mounting
manipulator is arranged on the rack, and a meter cover comprises a first mounting frame mounted on the meter cover mounting
manipulator, a cover screwing driving
assembly, a torsion adjusting
assembly and a meter cover clamping
assembly, the meter cover clamping assembly, the rotary cover driving assembly and the torsion adjusting assembly are coaxially arranged, the rotary cover clamping assembly comprises a multi-jaw chuck used for clamping a water meter cover, and limiting clamping assemblies used for clamping the two sides of a meter shell are arranged on the bearing base. The glass mounting mechanism comprises a replaceable first bearing plate and an adsorption clamping device for clamping observation glass and a sealing
gasket. The water meter cover can be automatically assembled, the torsion adjusting assembly can automatically and manually adjust torsion precisely, the water meter cover is prevented from being damaged, the device can adapt to water meters of different models, and manual operation errors are reduced.