Lower vehicle body rear structure and vehicle

A lower vehicle body rear structure, comprising:

• a rear floor integrally formed in a die-casting mode, rear floor longitudinal beam rear sections fixedly connected to the rear floor, a shelf, and a spare tire cabin;
• wherein the rear floor is formed with rear floor longitudinal beams arranged on two sides of the rear floor, a rear floor middle cross beam and a rear floor rear cross beam, wherein the rear floor middle cross beam and the rear floor rear cross beam are connected between the rear floor longitudinal beams on the two sides;
• and rear wheel covers respectively connected to the rear floor longitudinal beams on corresponding sides are arranged on the two sides of the rear floor;
• the shelf is located above the rear floor, and two ends of the shelf are arranged in one-to-one correspondence with the rear wheel covers on the two sides and both connected to corresponding rear wheel covers respectively by two connecting plates;
• and the rear floor, the shelf and the two connecting plates are connected to form an annular structure arranged along a height direction of a vehicle body;
• and
• a number of the rear floor longitudinal beam rear sections is two, and the rear floor longitudinal beam rear sections are connected to rear ends of the rear floor longitudinal beams on the two sides, a rear supporting plate is connected between rear ends of the two rear floor longitudinal beam rear sections, and the spare tire cabin is arranged in a mounting space defined by the rear floor, the rear supporting plate, and the rear floor longitudinal beam rear sections on the two sides;
• wherein rear floor force transmission beams are formed on inner sides of the rear floor longitudinal beams on the two sides;
• a rear end of each of the rear floor force transmission beams is connected to the rear floor middle cross beam;
• and
• the rear floor longitudinal beams and the rear floor force transmission beams on each side are connected by the rear floor middle cross beam to form a herringbone-shaped force transmission passage.