The invention discloses a sunken type fixing lock. The key points of the sunken type fixing lock are that the sunken type fixing lock further comprises a connecting rod and a connecting block, whereinthe connecting block is rotationally connected to a housing; the connecting block comprises a pulled part and a push part; the pulled part and the push part form an included angle alpha, and alpha islarger than 90 degrees and smaller than 180 degrees; one end of the connecting rod is in linkage connection with a key unlocking component; the other end of the connecting rod is in linkage connection with the pulled part of the connecting block; the push part of the connecting block is in linkage connection with a center rod; when a password wheel unlocking component is locked, the center rod islimited and cannot move, and the key unlocking component cannot move integrally; when the password wheel unlocking component is unlocked, the center rod is unlimited and is movable, and the key unlocking component moves integrally to drive a spring bolt unit to move to release a zipper puller of a bag so as to realize unlocking; the key unlocking component is used for driving the connecting rod to move when moving integrally; the connecting rod is used for driving the connecting block to rotate by virtue of the pulled part; and the connecting block rotates to push the center rod to move by virtue of the push part so that better co-movement and better structural stability are realized.