The utility model discloses a ladder antiskid, including base, dog and anti -skidding portion, the both sides of base are equipped with a facade respectively, the top edge of facade is equipped with a plurality of wedge sawtooth, between two facades and the upper surface of base be equipped with the dog, be equipped with the pin of block in the wedge sawtooth on the face of dog and facade contact, the lower surface of base is equipped with anti -skidding portion. The utility model discloses simple structure can effectually prevent that the ladder from for the slip on ground in the use, guaranteeing the safety of ladder when using.