Vehicle body side reinforcing structure and vehicle

A vehicle body side reinforcing structure, comprising:

• an A-pillar reinforcing plate in an A-pillar, a B-pillar reinforcing plate in a B-pillar, a roof side rail reinforcing plate in a roof side rail, a doorsill beam, a C-pillar, a D-pillar and a C/D-pillar connecting cross member;
• wherein
• the A-pillar reinforcing plate, the roof side rail reinforcing plate and the D-pillar are sequentially connected in a length direction of a vehicle body, the doorsill beam is connected between a bottom end of the A-pillar reinforcing plate and a front end of a rear floor longitudinal beam, and a rear end of the D-pillar is connected to a rear end of the rear floor longitudinal beam;
• and
• the B-pillar reinforcing plate is connected between a middle of the roof side rail reinforcing plate and a middle of the doorsill beam, the C-pillar is connected between a front end of the D-pillar and a front end of the rear floor longitudinal beam, and the C/D-pillar connecting cross member extends in the length direction of the vehicle body, and is connected between the C-pillar and the D-pillar.