Anti-loose structure for crawler

The utility model discloses an anti-loose structure for a crawler, which comprises a track shoe, a chain track segment, a bolt and a nut, wherein the track shoe is connected with the chain track segment; the screw hole is formed at the connection part of the track shoe and the chain track segment; the bolt penetrates the screw hole from one side of the track shoe, extends out of one side of the chain track segment, and is connected with the nut; the bolt comprises a head and a screw rod; the cross section of the head is circular; a groove is formed in the center of the head; and the cross section of the groove takes the shape of a regular polygon. The anti-loose structure has the benefits that the bolt for connecting the track shoe with the chain track segment can be prevented from getting loose effectively; the application is simple; and the cost is low.