The invention mainly provides a jointing type paper packaging box which comprises a box cover and a box body. The bottom end of the box body is detachably provided with a base, the box body is formedby jointing four surrounding plates and a base plate, U-shaped steel plates are fixed to the peripheries of the surrounding plates and the two sides of the base plate, and screws penetrate the U-shaped steel plates to fix the four surrounding plates and the base plate one by one to form a box structure with an opened upper end; the base comprises an upper sealing plate and a bottom box, U-shaped steel plates are fixed to the peripheries of the upper sealing plate and the bottom box, the upper sealing plate and the bottom box are fixed together through screws, and the jointed base is fixed to the bottom end of the box body through screws. The jointing type paper packaging box is simple in structure and simple in manufacturing, achieves the detaching and jointing aim of the overall box bodythrough cooperation of the U-shaped steel plates, saves cost, reduces raw material waste, meanwhile can adjust the size of the box body according to actual needs, and meets the cargo transporting need.