The invention discloses a landslide monitoring model device based on infrasound technology and an experimental method thereof and belongs to the technical field of landslide monitoring. The model device comprises an ultrasound sensor, a pressure sensor and a jack, a sliding block is formed by accumulating soil, the top surface of the sliding block is an inclined bevel, the sliding block is arranged on a rigid non-sliding block which is formed by pouring cement, the inside of the non-sliding block is hollow while the top of the same is open, and a hollow inner cavity is filled with soil which is compacted; the jack is fixed on a rigid wall, the ultrasound sensor passes a bobbin to be fixed at the top of the bobbin, the middle section and the bottom of the bobbin penetrate into the top surface of the sliding block, and the pressure sensor is arranged on the side portion of the sliding block and corresponds to the jack. The ultrasound sensor is utilized to receive ultrasound signals generated in the process of stressing, local damaging, critical sliding and overall sliding of earthy landslide and transmit the same to a control system to complete monitoring of the whole process of landslide of a sliding body.