CEL-APR100H 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 on and off the gas, two on-line sampling ports are reserved, equipped with ultraviolet high transmission quartz window and flanged 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.