Deformable sofa bed

The invention discloses a deformable sofa bed. The deformable sofa bed comprises a pedestal; the pedestal is composed of a fixed pedestal and a movable pedestal; the fixed pedestal is composed of a supporting frame; the movable pedestal is composed of a supporting platform; the side surfaces of the supporting platform are surrounded by the supporting frame; adjacent surfaces of the supporting frame with the supporting platform are connected with slide rails; the slide rails are arranged in parallel with a moving direction of the movable pedestal; armrests are fixed on the left side and the right side of the pedestal; a backrest is connected with the back side of the pedestal via hinge connection; the backrest is divided into two layers, a front backrest and a back backrest; the left-right width of the front backrest is equal to that of the back backrest; the front backrest is connected with the back backrest via hinge connection; the surface of the supporting platform is provided with a cushion; the left side and the right side of the cushion are pressed firmly against the armrests on the two sides; and the back side of the cushion is pressed firmly against the backrest. The deformable sofa bed is light, is small in size, and is simple in structure; transformation between a seat state and a bed state is realized easily; complex operation is not needed; the parts are relatively light; and deformation is easy to realize.