Child safety seat and safety belt automatic adjustment apparatus thereof

A child safety seat comprising:

• a base;
• a safety belt;
• a safety belt buckle connected to the safety belt;
• and
• a safety belt automatic adjustment apparatus comprising:
• a safety belt buckle fastening assembly rotatably connected to the base and protruding from the base, the safety belt buckle fastening assembly being configured to buckle with the safety belt buckle;
• a safety belt retractor comprising a rotating shaft, a first ratchet and a second ratchet, the safety belt winding around the rotating shaft, the first ratchet and the second ratchet being connected to two ends of the rotating shaft, directions of teeth of the first ratchet and the second ratchet being opposite to each other, the safety belt retractor further comprising a restraining assembly comprising:
• a first restraining component for selectively engaging with or separating from the first ratchet;
• and
• a second restraining component for selectively engaging with or separating from the second ratchet, wherein when the first restraining component is engaged with the first ratchet, the second restraining component is separated from the second ratchet, and when the second restraining component is engaged with the second ratchet, the first restraining component is separated from the first ratchet;
• and
• a linking component installed between the safety belt buckle fastening assembly and the safety belt retractor, the safety belt buckle fastening assembly rotating to drive the linking component to move, and the linking component moving to drive the first restraining component to separate from the first ratchet or to drive the second restraining component to separate from the second ratchet, so as to release or restrain the safety belt winding around the safety belt retractor.