A power-saving scissors comprises a first handle having a first knife set; the first handle being formed with a receiving space; an inner wall of the receiving space being formed with teeth; a second handle pivotally installed to the first handle by a planet gear set; the second handle having a second knife set; a center gear being protruded from the second handle at a position corresponding to the receiving space; the center gear being engagable with the receiving space of the first handle; the planet gear set including the center gear, three peripheral gears and a cover; one end of the center gear being installed to the second handle and another end thereof being protruded with a post; the three peripheral gear being respectively engaged to the center gear and also engaged to the teeth of the receiving space.