A banknote separating device for a financial self-service apparatus, comprising: a banknote separating wheel set and a reverse wheel set cooperated with the banknote separating wheel set, wherein the reverse wheel set comprises a reverse wheel component, a reverse wheel set rotating shaft, a first fixing frame, and a second fixing frame, two ends of the reverse wheel set rotating shaft are fixed respectively to two mounting side plates in the financial self-service apparatus, and the first fixing frame and the second fixing frame are respectively fixedly connected to two ends of the reverse wheel component; wherein an end, away from the second fixing frame, of the first fixing frame is provided with a first gap adjusting threaded hole, a first gap adjustment stop block extends from the mounting side plate at a side close to the first fixing frame, and the position of the first gap adjustment stop block corresponds to the position of the first gap adjusting threaded hole, a first gap adjusting screw is arranged in the first gap adjusting threaded hole, and a head portion of the first gap adjusting screw is in contact with the first gap adjustment stop block; and wherein the second fixing frame is provided with a second gap adjusting threaded hole, a second gap adjustment stop structure extends from an end, close to the second fixing frame, of the first fixing frame, and the position of the second gap adjustment stop structure corresponds to the position of the second gap adjusting threaded hole, a second gap adjusting screw is arranged in the second gap adjusting threaded hole, and a head portion of the second gap adjusting screw is in contact with the second gap adjustment stop structure. a banknote separating wheel set and a reverse wheel set cooperated with the banknote separating wheel set, wherein the reverse wheel set comprises a reverse wheel component, a reverse wheel set rotating shaft, a first fixing frame, and a second fixing frame, two ends of the reverse wheel set rotating shaft are fixed respectively to two mounting side plates in the financial self-service apparatus, and the first fixing frame and the second fixing frame are respectively fixedly connected to two ends of the reverse wheel component; wherein an end, away from the second fixing frame, of the first fixing frame is provided with a first gap adjusting threaded hole, a first gap adjustment stop block extends from the mounting side plate at a side close to the first fixing frame, and the position of the first gap adjustment stop block corresponds to the position of the first gap adjusting threaded hole, a first gap adjusting screw is arranged in the first gap adjusting threaded hole, and a head portion of the first gap adjusting screw is in contact with the first gap adjustment stop block; and wherein the second fixing frame is provided with a second gap adjusting threaded hole, a second gap adjustment stop structure extends from an end, close to the second fixing frame, of the first fixing frame, and the position of the second gap adjustment stop structure corresponds to the position of the second gap adjusting threaded hole, a second gap adjusting screw is arranged in the second gap adjusting threaded hole, and a head portion of the second gap adjusting screw is in contact with the second gap adjustment stop structure.