The invention belongs to the technical field of environment monitoring. The invention relates to a counter, in particular to a two-stage
refrigeration particulate matter condensation growth counter. The device comprises an inlet, an
evaporation chamber, a steam cooling heat insulator, a condensation chamber section I, a condensation heat insulator, a condensation chamber section II, a
nozzle and alight scattering counter which are connected in sequence, an outlet of the
light scattering counter is connected with a flow limiting hole through a hose, the flow limiting hole is connected with a three-way connector A through a hose, and a three-way connector B is connected with an
air pump through a hose; the pressure measuring device is respectively connected with the three-way connector C, the
evaporation chamber and the condensation chamber through hoses; and the temperature measuring device is respectively connected with the
evaporation chamber, the condensation chamber I section and the condensation chamber II section through circuits. According to the invention, the flow of particulate matters can be increased, so that the number of the particulate matters passing through the
optical detector is increased, the activation area of the particulate matters is enlarged, the detection efficiency of an instrument on small particulate matters is improved, the original series structure of two different working solutions is changed into an independent CPC, and the single-stage detection of 1-3 nano particulate matters is realized.