Upper drawstring structure of child safety seat

The utility model discloses an upper drawstring structure of a child safety seat, which comprises a shell, an upper drawstring hook, a guide clamping block, a guide chute, a button limiting piece and a button spring, the button limiting piece comprises a sliding block, a tension spring, a limiting rod and a limiting head, and the limiting head is respectively connected with an unlocking button; an unlocking trigger key is arranged at the end part of the unlocking button; a locking pin transmission part is further arranged in the shell, the locking pin transmission part comprises a torsional spring, a torsional spring arm and a movable locking pin, the other end of the locking pin can penetrate through and is movably connected to the guide clamping block, and the locking pin is used for locking the upper drawstring hook; according to the upper drawstring structure, the unlocking button, the guide clamping block, the button limiting piece and the locking pin transmission piece are arranged in a matched mode, lo