CEL-APR100H-3 photochemical temperature control integrated reactor, mainly made of glass, integrated molding. The reactor contains an integrated interlayer of controllable temperature water jacket, the vent pipe goes deep into the bottom of the reactor, the glass joint door can turn the gas on and off, set aside an on-line sampling inlet, configure ultraviolet high transmission quartz window and flange seal. Volume 100ml. It can realize visible and ultraviolet photocatalysis, gas-liquid, gas-phase catalysis, catalytic degradation, hydrogen production, oxygen production and CO2 reduction under atmospheric pressure.