The utility model discloses a combined support used for a country IV medium-heavy vehicle. The technical scheme is that the combined support used for the country IV medium-heavy vehicle comprises a support main body, a Tim Blue pump installation position, an air filter installation position and a DCU support installation position are arranged on the support main body. The combined support used for the country IV medium-heavy vehicle has the advantages that integrity is strong, the phenomenon that space is insufficient is solved, the quantity and the total weight of other supports are reduced, the height difference requirement of the Tim Blue pump and a Tim Blue liquid level is guaranteed, meanwhile key components of a post-processing system are installed below a driving cab, the key components are prevented from being exposed to the sun and rain, service life is prolonged, and the combined support used for the country IV medium-heavy vehicle is preferred by the light weight country IV vehicle types.