The utility model relates to a prevent wind inclined to one side Y type composite insulator, it includes I type composite insulator cluster, its characterized in that: it is still including a columnar order composite insulator cluster, I type composite insulator cluster middle part fixed connector, the one end of columnar order composite insulator cluster is passed through the fastener and is fixed on the connecting piece, the other end that props up columnar order composite insulator cluster passes through the mounting and installs on the shaft tower cross arm. The utility model discloses an aspect forms the collateral branch through be close to one columnar order composite insulator cluster of body of the tower side -mounting at I type composite insulator, constitutes a fixed triangular supports, the effectual swing that limits I type composite insulator, and this utility model structure is simple, convenient operation, the practicality is strong, on the other hand compares in V cluster insulator, and this utility model need not increase the cross arm size and change the tower head structure, can maximumly save the funds spending.