High-strength and high-toughness and weather-proof angle steel for iron tower and preparation method of angle steel

The invention provides high-strength and high-toughness and weather-proof angle steel for an iron tower and a preparation method of the angle steel. The high-strength and high-toughness and weather-proof angle steel for the iron tower comprises the following components of, by weight, 0.05%-0.10% of C, 0.15%-0.40 of Si, 1.10%-1.50% of Mn, less than or equal to 0.020% of P, less than or equal to 0.005% of S, 0.40%-1.00% of Cr, 0.30%-0.40% of Ni, 0.30%-0.40% of Cu, larger than or equal to 0.015% of Als, 0.02%-0.07% of N, 0.01%-0.04% of Nb, 0.01%-0.05% of Ti, 0.03%-0.08% of V and the balance Fe. The invention further provides the preparation method of the high-strength and high-toughness and weather-proof angle steel for the iron tower. The high-strength and high-toughness and weather-proof angle steel for the iron tower and the preparation method of the angle steel have the advantages that through combined design of alloying elements, the hot-rolled weather-proof angle steel which is high in strength, low in tem