The utility model provides an original manuscript feeding device and image forming device, this original manuscript feeding device installs including the original manuscript tray of placing the original manuscript the original manuscript tray detects down the detecting element that the original manuscript has or not, and detect the after -separating the sensor whether original manuscript passes through completely, detecting element with after -separating sensor cooperative control rubs paper roll operating condition with the hands, detecting element is including relative two at least rotatableactuators of after -separating sensor interval arrangement, and detect respectively the detection sensor of actuator spinning movement. The utility model discloses a two actuators detect the originalmanuscript simultaneously, only the measuring sensor at two actuators all sends out under the circumstances of signal, just can make to rub the paper roll with the hands and get into operating condition, avoids single signal worker to do under the mode and makes and rub the paper roll with the hands and be in the problem under the wrong operating condition because of detecting the mistake to improve rendition efficiency.