A container, comprising a bottom, four integrated foldable side plates , a door provided on at least one of the side plates and a hidden hinge comprising an upper hinge base , a hinge body and a lower hinge base , wherein said door and the at least one of said side plates are connected to each other through said hidden hinge and wherein: said container further comprises a hinge fixing structure used to hold the hidden hinge on the container, characterized in that at least one of the side plates and the door are respectively provided with grooves (1a1, 21) formed by the internal and external sidewalls thereof and used to accommodate the hinge bases , wherein said hinge fixing structure comprises: position limiting structures (1a13, 1a14, 213, 214) located in said grooves (1a1, 21) and used to prevent the hinge bases from releasing from mouth portions of said grooves respectively, and positioning structures provided on said upper hinge base and said lower hinge base and engaged with said position limiting structures (1a13, 1a14, 213, 214) respectively; wherein: said position limiting structures (1a13, 1a14, 213, 214) comprise positioning ribs (1a11, 1a12, 211, 212) located at the bottom of the grooves (1a1, 21) respectively; said position limiting structures (1a13, 1a14, 213, 214) are engaged with said positioning structures respectively so that said hidden hinge is held on the said container and said hidden hinge is completely invisible from the appearance of said container when the door is closed; said positioning ribs (1a11, 1a12, 211, 212) are used to prevent the hinge bases from moving around; said position limiting structures (1a13, 1a14, 213, 214) comprise hanging protrusions (1a13, 1a14, 213, 214) located at the mouth portions of said grooves (1a1, 21) respectively; said positioning structures are branches extending from the left and right side of the hinge bases ; and said branches are elastic pieces extending integrally from the left and right side of the hinge base respectively, and projections are provided at the ends of said elastic pieces respectively; and said hanging protrusions (1a13, 1a14, 213, 214) are tabs extending from both sides of the mouth portions of the grooves, wherein said tabs are engaged with said projections respectively so as to prevent the hinge bases from releasing from said grooves (1a1, 21). said position limiting structures (1a13, 1a14, 213, 214) comprise positioning ribs (1a11, 1a12, 211, 212) located at the bottom of the grooves (1a1, 21) respectively; said position limiting structures (1a13, 1a14, 213, 214) are engaged with said positioning structures respectively so that said hidden hinge is held on the said container and said hidden hinge is completely invisible from the appearance of said container when the door is closed; said positioning ribs (1a11, 1a12, 211, 212) are used to prevent the hinge bases from moving around; said position limiting structures (1a13, 1a14, 213, 214) comprise hanging protrusions (1a13, 1a14, 213, 214) located at the mouth portions of said grooves (1a1, 21) respectively; said positioning structures are branches extending from the left and right side of the hinge bases ; and said branches are elastic pieces extending integrally from the left and right side of the hinge base respectively, and projections are provided at the ends of said elastic pieces respectively; and said hanging protrusions (1a13, 1a14, 213, 214) are tabs extending from both sides of the mouth portions of the grooves, wherein said tabs are engaged with said projections respectively so as to prevent the hinge bases from releasing from said grooves (1a1, 21). <EOS>