The invention relates to a device with temperature control and light collecting functions for a gas solid-liquid solid photocatalytic reaction. The device includes a reaction tank arranged on a magnetic stirrer, a light source is arranged over the reaction tank, and the reaction tank includes a tank body and a convex-lens-type tank cover which is detachably arranged at an upper end opening of thetank body; the interior of the tank body is connected with a gas supplying device, a sand core plate for placing catalysts is detachably arranged at the lower end of the interior of the tank body, andthe side wall of the tank body is provided with a tank-body heat insulation interlayer; a tank-cover heat insulation interlayer is arranged inside the tank cover and is communicated with the tank-body heat insulation interlayer through a pipeline, and a constant temperature groove is connected between the tank-body heat insulation interlayer and the tank-cover heat insulation interlayer. The device is simple in structure and convenient to use and can effectively improve the photo-catalysis efficiency, at the same time, the leakproofness is good, the temperature is controllable, the light collection performance is high, experiments at certain pressures can be conducted, and therefore the device is suitable for different reaction types such as a gas-solid reaction and a liquid-solid reaction.