Safety belt adjustment mechanism and safety seat using the same

A safety belt adjustment mechanism disposed on a safety seat, the safety seat including a base and a seat, the seat being movably disposed on the base and being adjustable between a sitting position and a lying position, the seat including a backrest part and a seat part, wherein the safety belt adjustment mechanism comprises:

• a locking device disposed on a forepart of the seat part, for locking or releasing a safety belt of the safety seat;
• a first pin disposed on the seat part;
• and
• a second pin disposed on the base,
• wherein,
• the first pin and the second pin are used to guide the safety belt;
• in use, the safety belt sequentially passes through the locking device, around the first pin and the second pin, and extends to a front side of the backrest part along a rear side of the backrest part;
• and
• when the seat is adjusted from the sitting position to the lying position, the seat part moves in a direction approaching the base to bring the first pin on the seat part toward a direction approaching the base, such that a distance between the first pin and the second pin becomes shorter.