The invention provides a leveling method for an air-floating platform based on six-point support. The leveling method for the air-floating platform based on the six-point support comprises the following steps that (20) six supporting points from 1# to 6# are arranged on the air-floating platform in a square matrix mode, and six supporting mechanisms are jointly used for supporting the air-floatingplatform; (30) height variation of the six supporting points from 1# to 6# is measured by an altimeter when counterweight blocks are placed alone; (40) according to the air-floating platform, six-points support is changed into three-point support, and the height value of the six supporting points from 1# to 6# are recorded by the altimeter; (50) three-point support is changed into four-point support, and the height variation is measured; and (60) four-point support is changed into four-point support, and the supporting mechanisms are adjusted. According to the leveling method for the air-floating platform based on the six-point support, the air-floating platform is evenly supported by six points, the support rigidity and levelness requirements of the air-floating platform are ensured, andthe stable support of the air-floating platform for space equipment is ensured.