Abstract: Atmospheric particulate matter has a significant effect on air quality, human health, and climate change. Water-soluble ions are an important component of atmospheric particulate matter, and monitoring their concentration changes is crucial for air pollution control. However, in some challenging sampling environments, it is difficult to meet the monitoring requirements with stable environmental conditions, sufficient power supply, and water source guarantee for online ion analysers. In order to achieve high-frequency online capture and pre-treatment of water-soluble ions in atmospheric particulate matter under the condition of small volume and low energy consumption, a device based on membrane accumulation sampling have been independently developed. The device realizes automatic and continuous sample collection and pre-treatment, is easy to operate, efficient, and has low environmental requirements. Through the device, the high-frequency variations in the concentration of water-soluble ion components can be obtained, which plays an important role in understanding the contribution of emission sources and formation mechanisms of emission sources in the pollution process.