Four-balancing-weight crank shaft of diesel motor

The utility model provides a four-balancing-weight crank shaft of a diesel motor. The four-balancing-weight crank shaft of the diesel motor comprises a first main journal, a first rod journal, a second main journal, a second rod journal, a third main journal, a third rod journal, a fourth main journal, a fourth rod journal and a fifth main journal, which are sequentially arranged along the axial direction of the crank shaft, as well as a first balancing weight arranged between the first main journal and the first rod journal, a second balancing weight arranged between the third main journal and the second rod journal, a third balancing weight arranged between the third main journal and the third rod journal and a fourth balancing weight arranged between the fifth main journal and the fourth rod journal, wherein the first to fifth main journal, the first to the fourth rod journal and the first to the fourth balancing weight are integrally molded constructional elements which are made of alloy steel; and the widths of the first balancing weight, the second balancing weight and the fourth balancing weight are different, and the widths of the second balancing weight and the third balancing weight are the same. The four-balancing-weight crank shaft of the diesel motor provided by the utility model has the advantages of high intensity and light weight.