A light shielding and temperature controlling system comprises an adjustable light shielding device, an illumination and temperature monitoring device, a human body induction device and a host, wherein the adjustable light shielding device comprises at least one electric window blind mounted outside a window and a control unit of the electric window blind; the illumination and temperature monitoring device comprises an illumination intensity sensor, a temperature sensor and a corresponding signal processing circuit; the human body induction device comprises a thermal infrared detection sensor and a corresponding signal processing circuit of the thermal infrared detection sensor; and the host is connected with the adjustable light shielding device, the illumination and temperature monitoring device and the human body induction device through signal communication wires, and is used for receiving signals from the adjustable light shielding device, the illumination and temperature monitoring device and the human body induction device and sending instruction signals to the adjustable light shielding device, the illumination and temperature monitoring device and the human body induction device according to set programs. The light shielding and temperature controlling system can control temperature in a room with small energy consumption, can achieve a remarkable energy-saving effect by cooperating with traditional temperature adjusting equipment such as air conditioners and ventilation systems, and can also ensure a comfortable illumination environment for people in the room.