The utility model relates to a nuclear power station air radioactivity integrated comprehensive device. The nuclear power station air radioactivity comprehensive monitoring device is used for monitoring radioactive activity of air inside a safe shell, increases the measuring range, and improves measuring accuracy and efficiency; sampling design of a sampling device utilizes a parallel branch line pipeline, and the pipeline is provided with an air flow meter. The situation that flow of a measuring branch line is not affected during sampling is guaranteed; an iodine sampling device utilizes the parallel iodine box design, the pipeline is also provided with an accumulation flowmeter, the situation that flow of the whole sampling branch line is kept changeless basically during sampling is guaranteed, and relevant monitoring data are connected with a data net of a nuclear power station. Automation of a detecting process and networking of the measuring data are achieved, a on-the-spot disposal display unit can process and display the detecting data on the spot, burden of a central control system is lowered, and design of the whole system is more reasonable.