A siphon type essence diffuser having block-preventing and leakage-preventing capabilities includes an outer shell and a universal atomizer connector contained therein. The universal atomizer connector is of a tube shape formed integrally into a body, having a first end connectable to the bottle port of an essence oil container presently available on the market. A nozzle cover and an atomized plate are disposed on the tube port of the second end. An essence supply channel is disposed between the first end and the second end. A siphon essence oil supply mechanism is disposed on universal atomizer connector, with one end of a cotton rod pressing against a back side of the atomized plate, and with the other end of a cotton rod extending into the essence oil supply channel to absorb essence oil.
