The utility model discloses anair particulate mattersampler capable of realizing automaticmembrane replacement. The sampler comprises a case as well as a filter membrane storage mechanism, a lifting, clamping and rotating mechanism, a detecting mechanism and a control device which are mounted in the case, wherein the filter membrane storage mechanism comprises a to-be-tested filter membranestoreroom and a tested filter membranestoreroom which are mounted on an inner plate of the case; the lifting, clamping and rotating mechanism comprises a lifting device mounted on the inner plate of the case as well as a clamping device and a rotating device which are mounted on the lifting device; the control device is connected withthe detecting mechanism and the lifting, clamping and rotating mechanism. According to the sampler, manual membrane replacement is replaced by mechanical movement through multi-degree-of-freedom movement of a mechanical structure, so that the requirement for long-time sampling is met, and the labor intensity of workers is greatly reduced; a system performs automatic sampling on each filter membrane, and no manual interventionis required; a user can know the working state of a machine in real time by the aid ofa remote control and monitoring function and a short messagequery and notification function, so that unattended operation can be actually realized; and the sampler is reasonable in design, compact in structure, light in weight, good in portability and applicable to outdoor work.