The invention relates to the technical field of packaging boxes, in particular to a portable packaging box and a paperboard for assembling the portable packaging box. The portable packaging box comprise a bottom plate, edge plates, side plates and pull ropes; wedge-shaped flanges are arranged on the two sides, close to the edge plates, of the side plates, and the side plates wrap the edge plates through the flanges; due to a swinging action generated by moving in a hand-held state, packaging boxes collide with one another, commodities in the boxes can be affected, dynamic changing acting forceis generated on the pull ropes on box bodies, the hand tightening feeling is caused, and the using effect of the portable packaging box is weakened; therefore, through flexible strips arranged at thebottoms of the side plates, the side plates deflect on the bottom plate, the adjacent portable packaging boxes are attached to each other between the inclined side plates, the swing action of the pull ropes on the packaging boxes is buffered through pressing and stacking plates between the side plates and the edge plates, and collision between the packaging boxes in the portable state is avoided;and the hand tightening feeling is reduced, so that the use effect of the portable packaging box is improved.