The invention relates to a straightening booster aiming at the ectropion and entropion of drop feet of lower limbs. The straightening booster comprises straightening shoes, kneecaps, a straightening garment and leg supports, wherein the leg supports and the kneecaps are detachably connected with the straightening shoes through telescopic fixing belts, and the kneecaps and the straightening garment are detachably connected through the telescopic fixing belts; storage cavities for containing micro-brackets are formed in shoulder belts, vent holes are formed in the leg supports; fixed clamping holes are formed in two sides of the leg supports; and buckles for fixing the telescopic fixing belts are arranged on the straightening shoes, the kneecaps and the straightening garment, and the telescopic fixing belts with various length specifications are arranged in pairs. The straightening booster has the beneficial effects that the uninjured side of a patient with stroke is taken as a fixed support point, the micro-brackets and the telescopic fixing belts are combined to tow each fixed support point by virtue of a strip line puppet induced motion principle, a biomechanics lever principle and a pull rod theory, ankle joints, knee joints and hip joints are passively bent and stretched, the gravity center of four coronal planes of the patient is changed, a new human body standing gravity center is formed, the motion functions of affected limbs are coordinated, and the self-care ability of daily living of the patient is improved.