The invention discloses an energy saver with a condensate water guide flow plate. The energy saver comprises an energy saving device; one side of the upper part of the energy saving device is provided with a water inlet, and the other side is provided with a water outlet; the lower end of the energy saving device is provided with a smoke gas inlet, and the upper end thereof is provided with a smoke gas outlet; both sides of the smoke gas inlet are symmetrically provided with draining openings, the upper part of a cavity of the energy saving device is provided with a smoke pipe group, and the lower part of the cavity of the energy saving device is provided with a smoke gas guide flow device; the smoke gas in the smoke gas inlet enters a smoke pipe group through the smoke gas guide flow device and discharges through the smoke gas outlet. The energy saver is simple in structure; the energy saver effectively solves the flow direction of condensate water, and cannot corrode a boiler or a heating furnace and the like; besides, the energy saver can protect device and prolong the service life of the device; the condensate water cannot flow to the ground and pollute environment, and cannot flow to the ground to freeze in winter; and thereby, the energy saver prevents operators from fall damage.