The invention discloses a multifunctional pallet assembly. The multifunctional pallet assembly comprises a pallet and a downward fixing fixture and an upward fixing fixture, wherein the downward fixing fixture used for fixing a valve flange downwards and the upward fixing fixture used for fixing the valve flange upwards are supported on the pallet. A vertically-extending ventilating hole is formedin the downward fixing fixture. An end opening of the upper side of the valve flange can be inserted into the upper end of the ventilating hole. The upward fixing fixture comprises an upward fixing seat used for receiving a valve and a pressing structure used for pressing the valve onto the upward fixing seat. According to the multifunctional pallet assembly, assembling of a plurality of procedures can be completed by fixing the valve flange, structures of assembly lines are simplified, and the production efficiency is improved.