The utility model discloses a gravel packing device, which belongs to the packing field of oil fields, and comprises a visible bushing, an oil pipe, a fluid injection tube, a filter layer, a precision pressure gauge and a pressure control valve, wherein the oil pipe is sleeved in the visible bushing, the fluid injection tube and the filter layer are fixed on the lower portion of the visible bushing and are connected with the visible bushing, the precision pressure gauge and the pressure control valve are arranged on the tube wall of the fluid injection tube. Using the gravel packing device, gravel is filled in the visible bushing, then fluid is injected to the visible bushing, the injection pressure of the fluid is increased through the pressure control valve, the outflow of the fluid from the oil pipe in unit time is measured, the packing effect of different gravels can be measured. Using the gravel packing device, the packing performance of various gravels can be accurately and directly measured. Simultaneously, the gravel packing device has simple operation and low cost, and can provide reliable basis for choosing suited gravels to pack in different oil production conditions.