The utility model discloses a corner transmission tower for 330kV power transmission lines in multi-thunder and heavy polluted area, which comprises a tower body and a cross arm. The cross arm comprises four cross arm bodies fixedly arranged on the upper section of the tower body in sequence from upper part to lower part. The cross arm bodies are in truss structure, and chord members and web members of the cross arm bodies comprise an insulation inner core and an insulation outer layer. An interlayer is formed between the insulation inner core and the insulation outer layer, and insulation filler is filled in the interlayer. When in use, as the cross arm is made of insulation materials, compared with conventional similar towers, the corner transmission tower not only has the characteristics of light weight, high mechanical intensity, and good impact resistance, corrosion resistance and heat resistance and the like, but also leads the creeping insulation intensity between the high-pressure lead wire and the transmission tower grounding to be enhanced by about 100% to 180%, thus effectively improving the pollution-prevention and lightning-prevention capabilities of the transmission tower and guaranteeing the safe, steady and energy-saving operation of the power transmission system.