The invention relates to a fitness machine for strengthening lower body muscles and a hip joint. The fitness machine comprises a base, an upper body supporting part, a foot plate part and a movement locus guide part, wherein the base is arranged on the ground; the upper body supporting part is vertically arranged at the front end of the base, so that sports personnel can be supported by holding a handle; the foot plate part is arranged on the upper part of the base, so that the sports personnel can ride; and the movement locus guide part is used for guiding the movement path of the pedal plate part, so that the pedal plate part moves along a preset movement locus for exercising a lower body. According to the construction, the fitness machine has a simple structure, so that the fitness machine is convenient to install in a narrow space and is easy and convenient to use, and anyone can do exercise easily. Moreover, a pedal plate is moved along loci of a plurality of directions (frontward-backward, leftward-rightward and circular), so that an aerobic exercise effect and a tensile exercise effect are achieved, waist exercise, thigh muscle exercise and hip joint exercise of a human body can be performed, lower body muscles are strengthened, proud flesh on the abdomen and ribs of the human body are eliminated, the rotary range of the hip joint is increased, and greater psoas muscles are strengthened.