Curtain and drawstring adjustment device thereof

A curtain, comprising:

• a curtain body;
• a drawstring to drive the curtain body to be retracted;
• a retraction device to retract the drawstring;
• and
• an adjustment device, comprising:
• a base fixed to a bottom end of the curtain body and defining a shaft hole, wherein a sidewall bounding the shaft hole of the base defines a through slot, the base forms a plurality of first positioning portions distributed in a circle about a central axis of the shaft hole;
• a reel received and rotatably mounted in the shaft hole of the base, wherein an end of the drawstring passes through the through slot of the sidewall bounding the shaft hole and is wound on the reel, the reel forms a plurality of second positioning portions cooperating with the plurality of first positioning portions to prevent the reel from rotating;
• and
• a locking assembly for limiting an axial displacement of the reel.