A flexible circuit board test device, comprising: a main clamp, configured to locate a middle area of a flexible circuit board; a first rotating shaft arm and a second rotating shaft arm; wherein the first rotating shaft arm and the second rotating shaft arm are rotatably mounted on a first mobile table and a second mobile table through a first main shaft and a second main shaft respectively; the first main shaft and the second main shaft are located on two sides of the main clamp respectively; the first rotating shaft arm and the second rotating shaft arm each are provided with a sandwich space for simulating a motion space of the flexible circuit board; and the first mobile table is provided with a first driving component in transmission connection with the first main shaft, the second mobile table is provided with a second driving component in transmission connection with the second main shaft, and the first driving component and the second driving component are configured to drive the first rotating shaft arm and the second rotating shaft arm to perform unfolding and folding actions; and the first rotating shaft arm and the second rotating shaft arm are each provided with auxiliary clamps in the sandwich spaces, and the auxiliary clamps are configured to locate two ends of the flexible circuit board that enter the sandwich space, and are electrically connected to the flexible circuit board, wherein the first mobile table and the second mobile table are respectively provided with a mobile table driving mechanism, and the mobile table driving mechanism is configured to drive the first mobile table and the second mobile table to move in a horizontal plane to adjust positions of the first mobile table and the second mobile table with respect to the main clamp. a main clamp, configured to locate a middle area of a flexible circuit board; a first rotating shaft arm and a second rotating shaft arm; wherein the first rotating shaft arm and the second rotating shaft arm are rotatably mounted on a first mobile table and a second mobile table through a first main shaft and a second main shaft respectively; the first main shaft and the second main shaft are located on two sides of the main clamp respectively; the first rotating shaft arm and the second rotating shaft arm each are provided with a sandwich space for simulating a motion space of the flexible circuit board; and the first mobile table is provided with a first driving component in transmission connection with the first main shaft, the second mobile table is provided with a second driving component in transmission connection with the second main shaft, and the first driving component and the second driving component are configured to drive the first rotating shaft arm and the second rotating shaft arm to perform unfolding and folding actions; and the first rotating shaft arm and the second rotating shaft arm are each provided with auxiliary clamps in the sandwich spaces, and the auxiliary clamps are configured to locate two ends of the flexible circuit board that enter the sandwich space, and are electrically connected to the flexible circuit board, wherein the first mobile table and the second mobile table are respectively provided with a mobile table driving mechanism, and the mobile table driving mechanism is configured to drive the first mobile table and the second mobile table to move in a horizontal plane to adjust positions of the first mobile table and the second mobile table with respect to the main clamp.