The utility model discloses a scalable well detecting device, including bracket component, control system and collection system, wherein, control system includes control panel, power module to and the servo motor, steering wheel, first communication module and the light that link to each other with the control panel, the control panel passes through first communication module and links to each other with operating handle, collection system includes several camera and second communication module, the camera passes through second communication module and links to each other with mobile terminal, the bracket component includes support frame and gauge stick, gauge stick top and support frame center fixed connection, the gauge stick includes consecutive several connecting rod, connects through the steering wheel between 2 adjacent connecting rods, but the connecting rod is extending structure, and the camera of camera is installed at the gauge stick terminally. The well detecting device of above -mentioned structure can survey the well, guarantees cable worker well operation safety.