The utility model relates to an improved structure of a crab cage.It consists of an upper ring and a lower ring.The outer circumference of the upper ring is provided with a plurality of joint seats.Each joint seat is provided with a hole.The outer circumference of the lower ring is provided with a plurality of connecting rods corresponding to each connecting seat.A boss with an outer diameter smaller than the inner diameter of the hole is arranged at the end of each connecting rod.Insert each boss into each hole.Support and positioning can be formed by the combination rod stopping at the combination seat.So thatThe lower ring forms a support with a fixed spacing through each connecting rod.And an outer net can be integrated on the outer peripheral side of the ring group.The Internet can restrict theActivities of the lower ring,The end of the connecting rod is prevented from loosening from the inside out of the hole.The external network corresponds to theAt least one opening is arranged between the lower rings.On the peripheral side of the opening is provided with a leading net which extends towards the center of the ring group and has contraction elasticity.一種補蟹籠改良結構，係由一上環圈及一下環圈組成一環圈組，該上環圈外周緣設有複數結合座，各結合座上分別設有一孔，該下環圈外周緣設有複數結合桿分別對應於各結合座，各結合桿端部設有一外徑小於該孔內徑的凸柱，利用各凸柱插入各孔內，可藉由該結合桿擋止於該結合座形成支撐與定位，使該上、下環圈經由各結合桿而形成一具有固定間距的支撐，而於該環圈組外周側可套合一外網，該外網可限制該上、下環圈的活動，並防止該結合桿端部由孔內向外鬆脫，於該外網於對應上、下環圈之間的部位設有至少一開口，於該開口周側設有朝向該環圈組中央延伸且具有收縮彈性的導入網。
