The invention in particular relates to a flyback active-clamp, asymmetrical half-bridge switching converter control circuit and control method. According to the technical scheme of the circuit, a flyback control circuit is provided and controls an integrated control circuit controlling a switch tube and a clamping tube. The integrated control circuit comprises a driving unit of the switch tube, a driving unit of the clamping tube, and a turn-off holding driving unit. When the load is light or zero, the total of a turn-on time of the switch tube, a turn-on time of the clamping tube and a dead zone therebetween forms a single period. The time length of the single period is a fixed value. The turn-on time of the switch tube and that of the clamping tube are in a complementary relation in the single period. The time of the single period and a turn-off holding time form a total working period. Compared with the prior art, while ensuring the efficiency of a conventional circuit and the EMI advantage under a load no less than a light load, the circuit improves the light load efficiency and reduces the zero load power consumption.