The invention belongs to the technical field of detecting devices, and particularly relates to a motor monitoring device and a motor monitoring control method. The motor monitoring device and the motor monitoring control method provided by the invention are accurate in monitoring and capable of detecting forward and backward rotations of a motor. The motor monitoring device comprises a rotary detecting disc, a photoelectric switch positioning plate, a first photoelectric switch and a second photoelectric switch. The structural key points of the motor monitoring device are that the center of the rotary detecting disc is fixed to the end portion of a prolonged transmission shaft of the motor, and the photoelectric switch positioning plate is disposed at the center in front of the rotary detecting disc; a plurality of identical Z-shaped light-transmission openings are uniformly distributed at the periphery of the rotary detecting disc, the Z-shaped light-transmission openings are detection areas, areas between adjacent Z-shaped light-transmission openings are Z-shaped non-detection parts, and an overlapped part of the upper part and the lower part of one Z-shaped non-detection part in the length direction is greater than the width of one photoelectric switch; and the first photoelectric switch and the second photoelectric switch are vertically arranged on the photoelectric switch positioning plate.