The utility model relates to a circuit board detects technical field. A be applied to detection mechanism that stabilizes that circuit board detected machine, is including installation frame, power device, transmission rack and stablize detection device, the mounting plate erects to be arranged in the transmission rack top, for the installation frame provides the supporting, wherein, in the installation frame, power device drives it reciprocates to stabilize detection device, it includes camera mounting panel and buffering direction subassembly to stablize detection device, be provided with the array camera on the camera mounting panel, power device with the camera mounting panel is connected, power device drives the camera mounting panel removes to make the array camera to reciprocate, the one end of buffering direction subassembly with the installation frame is connected, the other end with the camera mounting panel is connected, buffering direction subassembly is in the camera mounting panel plays buffering and guide effect when removing.