Particulate matter concentration detection device

The invention provides a particulate matter concentration detection device which comprises a sampling chamber, a filter paper installation part, an air pump, a gas flow detection device, a beta-ray generator, a detector and a data processing part, the data processing part receives beta-ray intensity values detected by the detector in all sampling periods, and the detector takes a first time interval as a sampling period to detect the beta-ray intensity values. Calculating the equivalent particulate matter concentration of each sampling period based on a beta-ray absorption method; the data processing part is provided with a sample space, the sample space is used for sequentially storing the equivalent particulate matter concentration of each sampling period according to a sampling time axis sequence, and the capacity of the sample space is N; and the data processing part accumulates the equivalent particulate matter concentration of each sampling period in the sample space to obtain the real-time particulate