Steam-injection boiler fuel additive adding device and boil combustion system

The utility model provides a steam-injection boiler fuel additive adding device and a steam-injection boil combustion system. The steam-injection boiler fuel additive adding device comprises a additive box, a proportioning pump, a stirrer and a connecting pipeline; the additive box is of a box body structure and comprises a additive charging opening and a additive discharging opening, the stirrer passes through an opening at the top part of the additive box, a control part of the stirrer is positioned outside the additive box, a blade and a connecting shaft of the stirrer are positioned at the inner side of the additive box, the proportioning pump comprises an input opening and an output opening, the input opening of the proportioning pump is connected with the additive discharging opening of the additive box, the output opening of the proportioning pump is connected with one end of the connecting pipeline, and the other end of the connecting pipeline is connected with an steam-injection boil. The steam-injec