An environment friendly metal mechanical password lock cylinder capable of setting repeatedly password keys comprises password rebound leaves, a label panel, a fastener locking plate, a positioning plate, a fastener reset plate, an axis panel and a control plate. The label panel is fixedly connected with the positioning plate; the fastener locking plate is disposed between the label panel and the positioning plate; the fastener reset plate is slideably disposed on the positioning plate; the axis panel is matched and connected with the label panel; the control plate is slideably disposed on the axis panel; the password rebound leaf runs through the label panel and the positioning plate in sequence and corresponds to the control plate; the number of the password rebound leaves is set to be several; and at least one password rebound leaf in the plurality of password rebound leaves is provided with positioning blocks matched with the control plate.