The electric vascular coagulator for treatment of varicosity of lower limbs includes elastic electrically coagulating guide wire, insulating canal holding the electrically coagulating guide wire, and opened electrically coagulating clack-spring head set in the end of the guide wire and capable of extending from and withdrawing into the end of the canal axially. It has simple structure and convenient operation, and by means of electrically burning inner membrane of blood vessel, may be reached the effects of making blood vessel deform, necrose and adhere similar to excision of the blood vessel. Compared with traditional operation, the present invention has the advantages of less cut and damage, less influence on leg appearance and fast post-operation restoring.