Protection device for limbs of crossbow

A protection device of a crossbow, comprising:

• a limb, the limb including two first faces and two second faces, the two first faces located opposite from each other and extending in an axial direction of the limb, the second faces located opposite from each other and formed between the two first faces, a width of each first face being greater than a width of each second face, a hole defined through one end of the limb and through the two second faces, and
• a protection coat mounted to the limb, the protection coat including two first parts and two second parts, the two first parts connected to outside of the first faces of the limb, the two second parts connected to outside of the second faces of the limb, a flexibility of the protection coat being greater than a flexibility of the limb, the protection coat being deformed with the limb when the limb is deformed, two ends of the limb being exposed and not being mounted by the protection coat, the protection coat absorbing vibration from the limb when the limb bounces back so as to protect the limb from being broken.