The dynamic tension generated by the wind load of the icing conductor can easily cause fittings to fail and break, thereby affecting the safety of power grid operation. In order to evaluate the coupling influence of ice load and wind load on the collecting fittings. The numerical simulation obtained the dynamic tension and displacement at the key points of the conductor under different icing forms. Establish the fine metal model of fittings by software ANSYS. The stress field of Integral connection fittings under extreme environment is simulated to find out the weak position. The dynamic response analysis of the U-ring of dangerous parts was carried out, and the influence of icing form, dynamic tension and force form on the stress distribution of the U-ring was discussed. The results show that U-shackles is the most prone to failure in integral connection fittings under extreme ice wind load, and the maximum stress value is 509.02MPa, followed by the hole of connecting plate and the bend of the hanging plate. In the dynamic response analysis of the U-ring, the maximum stress value of the U-ring is 996.37MPa when the ice is uniformly covered by 15 mm. In the case of linear icing, the area beyond the yield limit of thick ice in the middle of the conductor is larger than that of thick ice on both sides of the conductor. Under the action of dynamic tension, when there is a rotational relationship between U-shackles, the damage to U-shackles is more serious than that under the action of pure tension.