The invention relates to a particulate matter sampler and a system thereof. The particulate matter sampler comprises a container, at least one ultrasonic transducer and at least one sampling tube; theultrasonic transducer is used for sending out ultrasonic waves; vacuoles are formed on the wall surface of the container and inside liquid under the action of the ultrasonic waves and move towards the specific part of the container, cavitation cloud converged to the specific part is formed in the container, and particulate matters in the container are converged to a fixed point in the container under the combined action of the ultrasonic waves and the cavitation cloud; and the sampling tube is used for taking out the particulate matters at a converging position. The particulate matter samplerand the system thereof, provided by the invention, have the beneficial effects that dispersed particles with different densities can be effectively fixed and quickly sampled, and the requirements ofrapid sampling from laboratories and industrial enterprise assembly lines are met.