The invention discloses a carbon fiber composite vehicle body. The carbon fiber composite vehicle body comprises bodywork and a bottom plate, the bottom plate is connected with the bottom of the bodywork, the bodywork is manufactured through integral forming, the bodywork comprises an outer skin, a sandwich layer and an inner skin which are sequentially arranged from outside to inside, reinforcing ribs are bonded on the inner skin, and the carbon fiber composite vehicle body has the advantages of being high in rigidity and strength, light in mass, soundproof and heat resistant. The carbon fiber composite vehicle body is formed by connecting the bodywork which is manufactured through integral forming with the bottom plate, connecting structures of the vehicle body can be greatly reduced, the rigidity and the strength of the vehicle body are improved, and the safety of the vehicle body is facilitated. The invention further discloses a manufacturing method of the carbon fiber composite vehicle body, the degree of production integration is high, and the method has important meanings on reducing the manufacturing cost and improving the rigidity and the strength of the vehicle body.