A submerged pump with an anti-reverse function comprises a vertical long-shaft submerged pump composed of a motor, a bearing chamber, a pump shaft, a
barrel, an
impeller and a
snail shell, the upper portion of the
barrel is connected with the bearing chamber, the lower portion of the
barrel is connected with the
snail shell, the pump shaft is located in the barrel, the lower portion of the pump shaft is connected with the
impeller, and a positioning sleeve is fixedly connected to the outer circle of the pump shaft through a bolt. A permanent
magnet ring is embedded in the outer circle of the positioning sleeve, the barrel is connected with a gland through a bolt at the permanent
magnet ring, the gland extends into the barrel and is close to the permanent
magnet ring, the gland is provided with a magnet exciting coil at the outer side of the permanent magnet ring, the magnet exciting coil is connected with a wire A and a wire B, the wire B is connected with an alarm, and the wire A is connected with a
resistor. When the pump shaft rotates reversely, current generated by the magnet exciting coil drives the alarm to give an alarm, an operator is prompted to reconnect a power line, and the shell prevents the submerged pump from rotating reversely.