Objective To explore the clinical characteristics and follow-up of venous leg ulcer recurrence after operation. Methods The complete clinical data of 45 patients with postoperative venous ulcer recurrence who underwent ultrasound-guided foam sclerotherapy in the First Affiliated Hospital of Hebei Medical University from June 2014 to December 2015 were retrospectively analyzed. And the dosage of foam sclerotherapy and the healing time of ulcer were observed in different groups of patients. Results There was no significant difference in the recurrent time among the patients with three different surgical methods (P > 0.05). In the superficial and perforating veins treatment group, the amount of foam was significantly larger than that in the superficial vein group or the perforating vein group (P < 0.05). Ulcer healing rate of the C5 group was significantly different from that of the C6 group (P < 0.05). The ulcer healing time was not significantly different between the patients with different genders in the 3 groups (P > 0.05). Body mass index and age were positively associated with ulcer healing time (P < 0.05). The incidence of superficial thrombophlebitis as the common post-sclerotherapical complication was 11.1%. The average amount of foam sclerosing agent used was larger in the patients with superficial thrombophlebitis than in the patients without thrombophlebitis (P < 0.05). The rate of complete or partial recanalization of diseased vessels was 20.0% at the end of 12-month follow-up. Conclusions Ultrasound-guided foam sclerotherapy in treatment of operated leg ulcer recurrence is effective and convenient with quick recovery and few postoperative complications.