The invention relates to an unpowered walking booster. Power-assisted assembly fixed parts are connected to the two sides of a waist belt respectively, the power-assisted assembly fixed parts are connected with power-assisted assemblies through a power-assisted assembly base, and the power-assisted assemblies are connected with leg tying parts through telescopic rods. Each power-assisted assembly comprises a plane scroll spring, a clamping ring, a crank slide block, a telescopic spring, and a power-assisted assembly shell, the power-assisted assembly shell is internally provided with a plane scroll spring and a crank slide block, the inner end of the plane scroll spring is fixedly connected to the center of the power-assisted assembly base through the clamping ring, the outer end of the plane scroll spring is connected with the crank slide block through the crank end of the crank slide block, the telescopic spring is installed between the crank slide block and the bottom of the power-assisted assembly shell, when the crank slide block moves up and down, the crank end drives the outer end of the plane scroll spring to rotate to compress the plane scroll spring to store energy, and when the energy is released, the unpowered walking booster can allow the legs to be lifted up. In the unpowered walking booster, a simple flexible structure is adopted, and the problem that old people and patients with functional disorders have insufficient muscle strength in lower limbs, and cannot normally walk is solved.