The invention discloses a control surface control mechanism which comprises a wing body, a control surface and a linear driver. The control surface is hinged to the wing body, and the linear driver can be lengthened and shortened in the length direction of the linear driver. The first end of the linear driver is directly connected with a first installation structure of the wing body, the second end of the linear driver is directly and rotationally connected with a second installation structure of the control surface, or the second end of the linear driver is rotationally connected with the second installation structure through a first connecting rod. The linear driver is used for driving the control surface to rotate relative to the wing body when the length of the linear driver is changed. In the control surface control mechanism, the linear driver directly drives the control surface or drives the control surface only through the connecting rod, a hinging gap of the whole mechanism issmall, the error generated when the linear driver drives the control surface to move is small, and the control accuracy of the control surface is high. The invention further discloses a model airplane applying the above control surface control mechanism, and the control surface control accuracy is high.