The invention discloses an angle-adjustable leg exercising device. The device comprises a support, the support is fixedly arranged on the ground, a containing cavity is formed in the support, an adjusting assembly is arranged in the containing cavity, a supporting assembly is arranged at the right side of the adjusting assembly, a buffering assembly is arranged above the supporting assembly, and the adjusting assembly is used for adjusting the angle between the two legs of a user. According to the invention, the problems that during traditional leg driving and stretching exercise, only a certain angle can be formed between the two legs for exercise, the exercise effect is single, and the muscles of the two legs cannot be stretched at different angles after long-time exercise, so that muscular soreness is likely to be caused are solved; through the arrangement of an adjusting device, the two legs of an operator form different angles during exercise, so that muscle groups at the inner sides of the two legs are exercised, and meanwhile, during exercise, the larger the angle formed by the two legs is, the better the stretching effect between the two legs is, and muscle soreness duringexercise is relieved.