The utility model provides a roofing eaves gutter mouth finished product close device belongs to the architectural engineering technology field, and the device is including adopting upper end opening, lower extreme open -ended round platform shell structure to and be provided with the building body of eaves gutter mouth, and round platform casing upper shed sets up to wide -mouth, under shed set up to the throat, and the round platform casing is sharp hypotenuse rotator, the round platform casing edge at wide -mouth edge is provided with horizontal abduction reason, the round platform casing edge at throat edge is provided with opens up the reason downwards under extend vertical, the pre -buried building at eaves gutter mouth periphery of horizontal abduction reason is internal, and horizontal abduction reason and eaves gutter mouth edge pass through building sealant sealing connection, pass through building sealant sealing connection between the vertical inner edge of opening up down the reason and the drowning velar plate, the generating line slope more than or equal to 5% of round platform casing is less than 50%. The device solves the problem that the peripheral surface course of roofing eaves gutter mouth closed up, but mill's processing reduces the on -the -spot amount of labour, and the operation is raised the efficiency, and the slope of asking around the assurance eaves gutter mouth satisfies standardizes the requirement.