The invention discloses a technological trolley for assembly of a rear axle structure of a passenger car. The technological trolley comprises T-shaped frames, a first U-shaped groove plate and a second U-shaped groove plate. The two T-shaped frames are fixed to two side plates of the first U-shaped groove plate correspondingly. A base is fixed to the bottom of the second U-shaped groove plate. A limiting mechanism is fixed to the base. The technological trolley is stopped and stabilized by adjusting the limiting mechanism. The I-shaped technological trolley composed of the designed T-shaped frames, the designed first U-shaped groove plate and the designed second U-shaped groove plate is simple in structure; and the two ends of a rear axle of the passenger car are supported through the T-shaped frame, the first U-shaped groove plate and the second U-shaped groove plate are matched with a protruding part of a differential mechanism of the rear axle of the passenger car, and the technological trolley designed according to the overall structure of the rear axle of the passenger car has the advantages that using is convenient, and the installation efficiency for the rear axle of the passenger car is improved.