The invention provides a heating energy-saving adjusting valve. The heating energy-saving adjusting valve comprises a motor, a worm speed reducing mechanism, a filler seal and a valve plate, and further comprises a worm rod shaft extending into a valve body, and a fan-shaped worm wheel arranged in the valve body; a worm wheel of the worm speed reducing mechanism directly drives the worm rod shaft;the worm rod shaft is in transmission connection with the fan-shaped worm wheel; the fan-shaped worm wheel is vertically arranged and fixedly connected with the surface of the valve plate; the fan-shaped worm wheel is rotated along with the worm rod shaft, and drives the valve plate to rotate; and the water circulating area in the valve body is changed through the valve plate, so that the water flowing magnitude is changed. Compared with the prior art, the heating energy-saving adjusting valve has the following beneficial effects: the first-grade transmission is arranged in the valve, so thathigh-transmission-ratio requirements can be met, and first-grade transmission structures are reduced; and meanwhile, the valve plate is directly pushed to rotate by the fan-shaped worm wheel, and a valve plate shaft only takes charge of rotating without generating torques, so that the adjusting capacity and the service life of the valve plate and the valve plate shaft are improved.