Sofa with extensible armrests

The utility model provides a sofa with extensible armrests, which comprises a seat body and the armrests arranged on two sides of the seat body, the armrests are mounted on the seat body through an extension frame, the extension frame comprises an upper connecting seat, a lower connecting seat and a connecting rod, the upper connecting seat is mounted on the armrests, the lower connecting seat is mounted on the seat body, and the connecting rod is mounted on the lower connecting seat. Upper and lower ends of the connecting rod are respectively hinged with the upper connecting seat and the lower connecting seat; the upper connecting seat at least has an inner limit position and an outer limit position; at least the lower connecting seat is provided with a limiting structure, and the limiting structure limits the connecting rod so as to limit the upper connecting seat to each limit position; the extension frame endows the armrest with a movable adjusting function, the upper connecting seat can be switched betwe