The invention discloses an automatic 
assembly machine for assembling an 
encoder for an 
intercom. The automatic 
assembly machine includes a case, a controller, a rotation disc, a 
cam divider 
assembly, an upper manual placement mechanism, a stopping base mounting mechanism, a first film sheet mounting mechanism, a second film sheet mounting mechanism, a first rubber rotation sheet mounting mechanism, a first body mounting mechanism, a second rubber rotation sheet mounting mechanism, a second body mounting mechanism, an oil 
coating mechanism, a riveting mechanism, a discharging mechanism and detection assemblies; a plurality of working 
station clamps are movably arranged on a circumferential edge of the rotation disc; In assembly, the upper manual placement mechanism transfers a manual placement shaft core sleeve to a matched working 
station clamp, and then the stopping base, the first film sheet, the second film sheet, the first rubber rotation sheet, the first body, the second rubber rotation sheet, the second body are mounted successively, the oil 
coating mechanism performs oil 
coating after the second body is mounted, the riveting mechanism rivets all the parts through rivets to form a finished product, and the discharging assembly sends the finished product to a collection box. The automatic 
assembly machine is easy to use, is high in assembly efficiency, is high in yield, is simple to maintain, and is long in service life.