According to the foam drainage difficulty for condensate oil-gas well, a kind of long chain alkyl amine oxide OA was synthesized using a long chain alkyl dimethyl tertiary amines as the main raw material and hydrogen peroxide as oxidant. Anticoagulant condensate oil frother main agent ZJ was obtained which introduced a small amount sulfonic acid salts surfactant with synergistic effect. It was compounded with stable foam agent to form a high anticoagulant compound foaming agent. The formula was obtained as follows: 2% ZJ, 0.04% NaOH, 0.03% guar gum. Under the condition of high condensate oil (50%—70%), the foam drainage performance of ZJ was superior to that of common foaming agent UT-11c. When the content of condensate oil was 70% at 70℃, the foaming capacity (initial foam height) of ZJ was 13.7 cm, foam stability (foam height after 3 min) was 9.8 cm, and liquid carrying capacity was 12 mL/15 min. The three data changed to 15.4 cm, 17.8 cm and 60 mL/15 min respectively after compounding. The resistance temperature was 90℃, and salt resisting mass fraction was 8%. This compound foaming agent was successfully applied in two effusion wells with high content of condensate oil (above 50%) of gas condensate in Wubaochang possession. Two intermittent production wells returned to continuous production, and the gas production increased about 40%.