The invention discloses an automobile cab assembling support which comprises a base seat and four stand columns arranged on the base seat. Two sliding rods are arranged on the base seat and parallel to each other. Two ends of each sliding rod are respectively provided with a first sliding block. First guide rails matched with the first sliding blocks are arranged on the base seat. The stand columns are arranged on the sliding rods. Each sliding rod is provided with two stand columns. Second sliding blocks are arranged below the stand columns. Second guide rails matched with the second sliding blocks are arranged on the sliding rods. The distance of the stand columns can be adjusted according to difference of suspension span of the front, the rear, the left and the right of different types of cabs, and the height of the stand columns can be adjusted, and therefore the automobile cab assembling support can adapt to cabs with different suspension height, and the automobile cab assembling support has the advantages of being good in generality, simple in structure, convenient to use and the like.