Vehicle side collision protection structure

The utility model discloses a vehicle side collision protection structure which comprises a B column, a doorsill beam and a seat installation cross beam, the B column comprises a B column outer plate, and the B column outer plate is fixed on the doorsill beam; the seat installation cross beam is located between B columns on the two sides of an automobile body and connected with a doorsill beam. The B-pillar outer plate comprises a B-pillar upper plate and a B-pillar lower plate, and a plane formed by a splicing line of the B-pillar upper plate and the B-pillar lower plate and an R point of a driver should be parallel to an XY plane; the B-pillar upper plate is provided with a B-pillar reinforcing plate, and the B-pillar reinforcing plate is located between the B-pillar upper plate and the B-pillar inner plate; the B column reinforcing plate extends in the Z direction to form a first extension part, and the B column reinforcing plate extends in the-Z direction to form a second extension part; the first extensi