The invention discloses a gas foam-assisted steam drive thickened oil recovery simulation experiment device and method. The gas foam-assisted steam drive thickened oil recovery simulation experiment device comprises a model body, an injection device and a production device, wherein the model body comprises a lower box and an upper cover which can be arranged on the lower box in a covering mode, sand filling ports and an injection port which can be opened or closed are formed in the upper portion of the upper cover, a first vertical well, a second vertical well, a third vertical well, a fourth vertical well, a fifth vertical well, a sixth vertical well, a seventh vertical well and an eighth vertical well are arranged in the lower box; the injection device comprises a water injection device capable of communicating with the fifth vertical well, an oil injection device capable of communicating with the first vertical well and the injection port, a steam injection device capable of communicating with the first vertical well, and a foam injection device capable of communicating with the first vertical well; and the production device communicates with the second vertical well, the third vertical well and the fourth vertical well. By adoption of the gas foam-assisted steam drive thickened oil recovery simulation experiment device and method, the situation when a certain amount of gas foam is added in the steam drive process can be simulated accurately.