The invention relates to a physical simulation experimental device for fluidization deformation of loosened settlings. The physical simulation experimental device is characterized in that a sedimentation pipe (1), a water gathering pipe (2), a water feeding pipe (4) and a water feeding collecting pipe (7) are arranged in a structure of the physical simulation experimental device; experimental sand (8) and water stopping coarse sand (13) are respectively fed in the sedimentation pipe (1) and the water gathering pipe (2); hyper-pressure is formed on a liquefying layer by continuously injecting water in the experimental device, and is finally higher than the formation pressure, so that deformation such as invasion and ejection is caused, pressure gradient and water feeding flow in a deformation process are accurately measured, and the relation among the formation pressure, the flow and distribution of deformed sand bodies is described semi-quantitatively or quantitatively; the sedimentation pipe (1) is connected with the water gathering pipe (2) by a flange (11); and the sedimentation pipe (1) can be taken out from the experimental device conveniently, so that an experiment can be repeatedly carried out. The physical simulation experimental device has the advantages that the device is simple in structure and convenient to operate, facilitates observation and is economical and practical.