The invention discloses a measuring apparatus, system and method for the dynamic data of moving particles in a gas-solid fluidized bed, belonging to the technical field of measurement of particle sedimentation. The measuring apparatus, system and method overcome the problem that dynamic data during upward and downward fluctuation and upward floating of particles cannot be measured in the prior art. The measuring apparatus comprises a compressed air unit, a dense medium, a gas-solid fluidized bed, a density ball, a rigid connecting rod and a displacement sensor for measuring the displacement ofthe rigid connecting rod, wherein the airflow outlet of the compressed air unit communicates with the air inlet of the gas-solid fluidized bed; the dense medium is located in the gas-solid fluidizedbed; and the density ball is fixedly arranged on the bottom end of the rigid connecting rod. The measuring apparatus, system and method of the invention can be used for measuring the dynamic data of moving particles in a dense-phase gas-solid flow field.