The utility model discloses an intelligent number-of-people detection device, which is characterized in that the device comprises a reflecting plate, a reflection-type optical coupler, a processing circuit and a display device, the reflection-type optical coupler, the processing circuit and the display device are sequentially connected, the reflecting surface of the reflecting plate faces to the reflection-type optical coupler, and the reflection-type optical coupler comprises an infrared transmitter and an infrared receiver. The reflection-type optical coupler receives the pulse signal trigger optical signals of the processing circuit and gives feedbacks to the processing circuit through the reflecting plate and the infrared receiver, and the processing circuit conducts analysis and statistics and controls the display device to display. Since pulse signals are adopted, electric energy is saved and service time is prolonged; since the reflecting plate and the reflection-type optical coupler are concealed, the reflecting plate and the reflection-type optical coupler are not apt to be found and the statistics of the number of people is more accurate; and the number of people can be counted accurately without requiring personnel to stay in the field and therefore the automatic field management is realized.