The invention discloses an indoor motion supporting robot system for old people and an application method thereof. The system comprises a front supporting device and a rear supporting device, each ofthe front supporting device and the rear supporting device comprises a control system module, a supporting mechanism, a moving executing mechanism, and a human body motion and environment sensing sensor system, wherein both the number and the types of sensors of the front supporting device and the rear supporting device are the same, the front supporting device and the rear supporting device are symmetrically arranged and can clamp the old people together, and the control system module is installed on the moving executing mechanism. The indoor motion supporting robot system for the old peoplehas an active following function, an auxiliary supporting moment is actively given when the old people fall down, and the passibility of the indoor environment width can be analyzed in real time; andparticularly, the supporting moment supplied to the old people can be guaranteed when the old people make complex turnings, scraping with the surrounding environment can be prevented, and most importantly, automatic following can be given when the old people normally run, so that the indoor motion supporting robot system for the old people is convenient and flexible to use and has a wide market prospect.