Drive axle balance suspension and car crane

The invention discloses a drive axle balance suspension and a car crane. The drive axle balance suspension comprises two groups of balance units, and a balance support which is arranged between the two groups of balance units and hinged with a car frame; each group of balance units comprises a balance rod, a swinging arm and a plate spring; one end of the balance rod is hinged with the balance support, the other end of the balance rod is hinged with a first end of the swinging arm, a second end of the swinging arm is hinged with the car frame, the plate spring is arranged on a car axle, one end of the plate spring is lapped on a third end of the swinging arm, and the other end of the plate spring is lapped on the balance support; and the balance rod, the swinging arm and the plate spring in each group of balance units form a four-bar mechanism with the balance support. The two balance units in the drive axle balance suspension rotate around the car frame by virtue of the balance support; and when the car axle with a relatively large designed shaft load runs on a fluctuated pavement, the vertical load is identical under any situation, so that the entire car is stable to run.