The utility model provides a box roof frame underframe and wallboard joint construction, includes wallboard, top frame and the underframe in box room, the top connecting piece be U type indent, outer ledge inserts within the draw-in groove that the frame bottom set up and top on the limb of the outside of draw-in groove, the inboard level in the box room of the tip of the inboard limb of draw-in groove orientation is buckled, form support the roof downside to the limit, connector terminal the bottom connecting piece is the bottom of the wallboard board of borduring, bordures the board and buckle downwards and form a convex part in the bottom, and the inboard sliding connection of this convex part still is fixed with the baffle in the buckle outside of a few type slide rails of forming of underframe on the underframe, and the fixed of wallboard is realized to the sealed colloid that the outside of the convex part inboard through the baffle is covered with. The utility model discloses simple to operate is swift, need not other mountings, has saved the secondary fitment to the furred ceiling board during installation, has saved manpower and materials.