The invention discloses a method of employing a diaphragm metering pump as a mechanical pulse generator of a pulse extraction tower in the field of extraction equipment; an inlet one-way valve ball of the diaphragm metering pump is taken out, the inlet of the diaphragm metering pump is connected with a lower clarifying segment of the pulse extraction tower, the outlet of the diaphragm metering pump is connected with an exhaust pipe through a valve, and the height of the diaphragm metering pump is generally situated at the middle lower part of an upper clarifying segment; the metering pump works in a pulse manner, and the diaphragm metering pump is used as the mechanical pulse generator of the pulse extraction tower so as to simplify the system and to increase the reliability of the system; furthermore, the corrosion resistance is better, the system is free from leakage, and the extraction tower works more stably.