The invention discloses a siphon type liquid level metering device for a vertical storage tank. The device comprises a siphon pipe extending into a tank body and a liquid level display pipe connectedwith the siphon pipe, wherein the siphon pipe can suck liquid from the tank body and enable the sucked liquid to enter the liquid level display pipe, and the liquid level display pipe is vertically arranged on the outer side of the tank body and can display the liquid level. After the structure is adopted, the siphon pipe is used in combination with the liquid level display pipe, liquid in the tank body is sucked by ingeniously utilizing the siphon action of the siphon pipe, meanwhile, the liquid level in the tank body is effectively displayed through the liquid level display pipe, so that installation can be carried out only by reserving a port at the top of the tank body, additional holes do not need to be formed on the side wall of the tank body, installation cn be conducted without draining media in the storage tank, the tank wall leakage risk is reduced, operation of installing a liquid level meter on the tank body is simple, and time and labor are saved.