The invention relates to the roof accumulated snow removing technology, in particular to a roof energy-saving automatic melted snow collecting system. The roof energy-saving automatic melted snow collecting system solves the problems that an existing roof accumulated snow removing device is low in snow removing efficiency, poor in work reliability, poor in environmental protection property and low in automation degree. The roof energy-saving automatic melted snow collecting system comprises a main house portion, a roof snow removing portion, a melt water collecting portion and a sensory control portion. The roof snow removing portion comprises a first rail, a second rail, a first bearing seat, a second bearing seat, a third bearing seat, a fourth bearing seat, a first pulley shaft, a second pulley shaft, a first fixed pulley, a second fixed pulley, a third fixed pulley, a fourth fixed pulley, a first steel wire rope ring, a second steel wire rope ring, a snow removing brush, a first idler wheel, a second idler wheel, a two-way motor, a pinion, a large gear and a mica heating board. The roof energy-saving automatic melted snow collecting system is suitable for houses with plane roofs or roofs close to planes and with the snow removing brush convenient to install.