The utility model discloses a high-efficiency automatic protective film tearing-off machine, and relates to an automatic protective film tearing-off machine for manufacturing printed circuit board in a dry-film developing process. A single-sided adhesive tape is arranged on a rotating roller, the width of the single-sided adhesive tape is 3mm to 5mm. By using the power of the rotating roller and the stickiness of the single-sided adhesive tape, the protective film of PCB board with two-sided protective film is completely torn off, and complete recycled. The high-efficiency automatic protective film tearing-off machine not only can improve the work efficiency of personnel, but also greatly reduce the loss and cost of materials.