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A finite element model of a diesel engine crankshaft is established with ANSYS and FE-SAFE softwares.Then the bending moment and fatigue life of crankshaft bending are calculated.Finally the crankshaft bending fatigue test is carried out on test bench, both the simulation results of the finite element software and experimental results are consistent, and the results show that : the combination method of simulation software and bench test proves the journal fillet of crankshaft connecting rod is the weakest part of crankshaft bending fatigue, and it provides an important significance for the design and production of crankshaft.