The invention relates to an experimental orifice plate for a pulse-jet dedusting bag precipitator experimental system, characterized by comprising an outer case, a shell, a filter bag mounting plate, a lifting device and a seal, the shell is mounted in the outer case, the filter bag mounting plate is mounted in the shell, jet height, namely a distance from a filter bag opening to a nozzle, can be freely adjusted through the lifting device, filter bag spacing is adjusted through the filter bag mounting plate that is detachable and adjustable, filter bags of different materials, types, specifications and sizes can be interchanged by designing a series of filter bag mounting plates uniform in assembled shape but different in filter bag mounting hole, design effort and manufacture cost can be greatly reduced, experimental operations are facilitated and quickened, the mass complex and varying experimental requirements requiring such as changes in filter bag type, specification, spacing and jet height can be met particularly, and in addition, experimental period is shortened, manufacturing cost is reduced and total experimental cost is reduced.