The invention discloses a foam scrubbing agent dynamic performance evaluation device. The invention relates to the technical field of oil-gas well experimental models. Foam drainage system, a gas supply system and a liquid supply system, The foam drainage system comprises an inner pipe and an outer pipe arranged outside the inner pipe in a sleeving mode. each of the inner pipe and the outer pipe comprises vertical sections which are sequentially connected from top to bottom; wherein the upper end and the lower end of the outer pipe are sealed, the vertical section of the inner pipe is providedwith an air inlet and a liquid inlet, the lower end of the inner pipe is provided with a disperser, the disperser is provided with a plurality of circulation openings communicated with the inner space of the outer pipe, and the vertical section of the outer pipe is provided with a liquid outlet; The foam drainage system further comprises an angle adjusting device, the angle adjusting device is used for adjusting the included angle between the adjustable section of the outer pipe and the vertical section of the outer pipe, and the included angle between the adjustable section of the inner pipeand the adjustable section of the outer pipe is consistent with the included angle between the vertical sections of the inner pipe and the outer pipe. The evaluation device provided by the utility model can simulate the actual production state when gas and water of wells with different inclinations are produced at the same time, so that the dynamic evaluation result of the foam performance is closer to the on-site actual condition.