The invention discloses an oil atomizer nozzle hole oil injection quantity measuring device which comprises an oil atomizer, an oil atomizer clamping device and an oil injection quantity separator. The oil atomizer clamping device is used for pressing the oil atomizer and the oil injection quantity separator together through an elastic supporting part at the bottom. The oil injection quantity separator and the oil atomizer can rotate relative to each other. The oil injection quantity separator is provided with a pit corresponding to a spherical structure at the top of an oil nozzle. The pit is internally provided with flow dividing holes with the number being the same as that of nozzle holes of the oil atomizer. One ends of the flow dividing holes are connected with the pit and the other ends of the flow dividing holes are connected with connecting pipes on the outer side of the oil injection quantity separator. The connecting pipes are connected with containers and used for collecting oil injected from the nozzle holes of all oil atomizers. The axis direction of the flow dividing holes are the same as the axis direction of the corresponding nozzle holes, and the diameter of the flow dividing holes is greater than that of the nozzle holesof the oil atomizer. The diameter of the pit is greater than that of the spherical structure at the top of the oil nozzle. The oil atomizer nozzle hole oil injection quantity measuring device is more convenient to operate and more accurate in measuring.