A kind of structure-improved for mending crab pot,With seat under two sheets disposed in parallel,Upper cover,One outer net be provide with seat under what,Between upper cover periphery,And multiple openings are equipped at intervals on the outer mesh enclosure of what,Each opening side is equipped with towards outer mesh enclosure internal stretch and has the importing net for shrinking elasticity,Multiple support component systems interval set seat under what,Between upper cover,Each support component be respectively equipped with two groups symmetrically set the what lower seat,The pin joint seat of upper cover,Guide sliding base,And a cross link,A vertical guide groove is respectively provided on two pin joint seats,Two guide sliding bases are equipped with horizontal guide groove,Cross link has two first ends towards pin joint seat,And two towards guide sliding base second end,Two first end systems are respectively protruding into two vertical guide grooves,Two second end systems are respectively protruding into horizontal guide groove,Change the position in the horizontal guide groove of what using two second ends,Can make cross link change support the lower seat,The distance between upper cover,Occupied space is effectively reduced when folding with what.一種補蟹籠之改良結構，具有二平行設置的片狀下座、上蓋，一外網罩設於下座、上蓋周緣之間，且於外網罩上間隔設有多個開口，各開口周側設有朝向外網罩內部延伸且具有收縮彈性的導入網，多個支撐組件係間隔設於下座、上蓋之間，各支撐組件分別設有二組對稱設於該下座、上蓋的樞接座、導滑座，及一交叉連桿，二樞接座上各設有一縱導槽，二導滑座上設有橫導槽，交叉連桿具有二朝向樞接座的第一端，以及二朝向導滑座的第二端，二第一端係分別伸入二縱導槽內，二第二端係分別伸入橫導槽內，利用二第二端改變於橫導槽內的位置，可使交叉連桿改變支撐該下座、上蓋之間的距離，以於收合時有效減小佔用空間。
