Middle section structure of three-waist-beam type side wall framework for safe rollover of passenger car

The utility model provides a three-waist-beam type side wall framework middle section structure for passenger car rollover safety, which comprises a top longitudinal beam, an upper waist beam, a lower waist beam, a skirt edge beam, a side window upright post and a cabin door upright post, an inner waist beam is arranged between the upper waist beam and the lower waist beam in parallel, and two ends of the side window upright post are respectively welded with the top longitudinal beam and the lower waist beam; the two ends of the cabin door stand column are welded to the inner waist beam and the skirt edge beam respectively. According to the side wall framework structure, the inner waist beam is additionally arranged; seat fixing angle steel is omitted, the side window stand column extends downwards and then is welded to the lower waist beam, and meanwhile the cabin door stand column extends upwards and is welded to the inner waist beam, so that the side window stand column and the inner waist beam as well as