The invention provides a cut split-type anti-tearing wood iron nail. The iron nail comprises a nail rod and a top cap; the iron nail is characterized in that the front end of the nail rod is provided with a nail tip, the nail tip is of a conical shape on the whole, left-and-right symmetrical sliding pieces protruding out of a cone surface are arranged on the left and right sides of the cone surface of the nail tip respectively, and continuous cutting edges are arranged on the front ends of the sliding pieces, the outer edges of the front segments of the sliding pieces, the outer edges of the rear segments of the sliding pieces and the connection parts; the outer edges of the connection parts of the top cap and the nail rod are respectively provided with blocking pieces which are front and back symmetrical and extend forward along the surface of the nail rod, the front and rear lengths of each blocking piece are both greater than the diameter of the nail rod, the lower end of each blocking piece is sloped and the inner edge is longer than the outer edge, the blocking pieces get thinner gradually from inside to outside, the lower ends of the blocking pieces are provided with the cutting edges which get thinner gradually, and two blocking pieces and two sliding pieces take the nail rod as the axis and are distributed in a staggered mode by the 90 degree phase angle. According to the cut split-type anti-tearing wooden iron nail, the probability of wood damage can be reduced, the connection is firmer, even if a small fissure is produced can cause actual blocking off through the blocking-off pieces getting into the fissure, the result of a permanent opening is avoided, and the iron nail is particularly suitable for some construction sites with higher requirements.