Semi-automatic suitcase capable of being unfolded to form bed

The invention discloses a semi-automatic suitcase capable of being unfolded to form a bed. The semi-automatic suitcase comprises a front side box body and a back side box body, wherein the front sidebox body and the back side box body have identical structures, are symmetrical at front and back and are in square shapes; a lying plate can be put onto a back lower bottom plate through being turnedbackwards around a front box body shaft; two transmission mechanisms are started; a front main panel rotates forwards around the shaft axis of the front box body shaft, and a back main panel rotates backwards around the shaft axis of a back box body shaft; a front upper top plate is driven to slide forwards, and a back upper top plate is driven to slide backwards; when the back upper top plate slides backwards to a location of a rear spring pin positioning hole, the front upper top plate just slides forwards to the location of a front spring pin positioning hole; the front main panel is just turned forwards to a horizontal position; and the back main panel is just turned backwards to a horizontal position. The semi-automatic suitcase disclosed by the invention can be used as a conventionalsuitcase; under necessary conditions, the available volume of the suitcase can be increased; and the suitcase can also be unfolded to form the bed for people to have a rest through lying down.