Optical sensing module

The invention discloses an optical sensing module. The optical sensing module comprises an infrared emitting unit and an infrared receiving unit. The infrared emitting unit comprises an infrared emitting tube, a voltage stabilizing tube circuit for driving the infrared emitting tube and a power source for providing power for the infrared emitting tube and a voltage stabilizing tube. The power source and the voltage stabilizing tube circuit are connected with the infrared emitting tube in series. The voltage stabilizing tube provides the stable voltage, and a constant current can be obtained after a constant load is connected with the voltage stabilizing tube; after a voltage stabilizing circuit formed by the voltage stabilizing tube and the load jointly is connected with the infrared emitting tube in series, the obtained circuit can replace an existing constant current circuit to serve as a driving circuit for providing the constant current for the infrared emitting tube.