The utility model discloses a machinery wrist -watch major diameter calendar structure, including hour wheel, day third wheel, trade the sun, calendar ring, the hour wheel is connected with actuating mechanism, and sun rotation is traded through crossing the wheel drive day to the hour wheel, trades to take turns to day to set up and trades the sun, trades the sun and meshes with the tooth that the calendar encircled, still including a day locating lever, the tooth of calendar ring is cut to day locating lever under the pressure of day location pole spring in. The utility model has the advantages that: novel structure, and calendar ring diameter is big, and 31 characters are big, conveniently watch the date, day locating lever increasing is fixed a position more reliably, trade sun extension, normally trade to go through still fast all very in a flexible way, reliable when dialling the calendar, and do not have the forbidden zone during fast group of calendar, fast pusher dog diameter increaseed day, and 4 claws, and the location is stable in the time of fast group.