A control device for an unmanned aerial vehicle, comprising: a shell; an inertial measurement device, which is fixed in the shell; and a main flight control circuit board, which is electrically connected to the inertial measurement device; characterized by further comprising: a flexible interface board, which is electrically connected to the main flight control circuit board and is appressed against an inwall of the shell, wherein, at least one external device is connected to two opposite sides of the flexible interface board through the shell; wherein the flexible interface board includes: a first interface board (5.2) and a second interface board (5.3), which are opposite to each other; and a first flexible board (5.4), which is connected to the first interface board (5.2) and the second interface board (5.3), wherein the first interface board (5.2) and the second interface board (5.3) are provided with a plurality of pin headers (5.1) electrically connected to the external device, and the first flexible board (5.4) is electrically connected to the main flight control circuit board. a shell; an inertial measurement device, which is fixed in the shell; and a main flight control circuit board, which is electrically connected to the inertial measurement device; characterized by further comprising: a flexible interface board, which is electrically connected to the main flight control circuit board and is appressed against an inwall of the shell, wherein, at least one external device is connected to two opposite sides of the flexible interface board through the shell; wherein the flexible interface board includes: a first interface board (5.2) and a second interface board (5.3), which are opposite to each other; and a first flexible board (5.4), which is connected to the first interface board (5.2) and the second interface board (5.3), wherein the first interface board (5.2) and the second interface board (5.3) are provided with a plurality of pin headers (5.1) electrically connected to the external device, and the first flexible board (5.4) is electrically connected to the main flight control circuit board. a flexible interface board, which is electrically connected to the main flight control circuit board and is appressed against an inwall of the shell, wherein, at least one external device is connected to two opposite sides of the flexible interface board through the shell; wherein the flexible interface board includes: a first interface board (5.2) and a second interface board (5.3), which are opposite to each other; and a first flexible board (5.4), which is connected to the first interface board (5.2) and the second interface board (5.3), wherein the first interface board (5.2) and the second interface board (5.3) are provided with a plurality of pin headers (5.1) electrically connected to the external device, and the first flexible board (5.4) is electrically connected to the main flight control circuit board. a first interface board (5.2) and a second interface board (5.3), which are opposite to each other; and a first flexible board (5.4), which is connected to the first interface board (5.2) and the second interface board (5.3), wherein the first interface board (5.2) and the second interface board (5.3) are provided with a plurality of pin headers (5.1) electrically connected to the external device, and the first flexible board (5.4) is electrically connected to the main flight control circuit board.