The petroleum contaminated soil treated by chemical solidification/stabilization with cement (S/S cement) can be used to backfill the road base and shallow foundation. In order to ensure the stability of the solidified petroleum contaminated soil in use, it is necessary to systematically study the performance properties of the solidified soil. To this end, the systematic laboratory experiments were conducted in this paper. It focuses on the performance properties of solidified petroleum-contaminated soils with different diesel content, curing time and cement content. The experimental results show that the unconfined compressive strength (UCS) of solidified soil decreases with the increase of petroleum contents, and increases with the increase of cement content; after 28 days of curing, the effect of cement solidification is obvious, and the strength value of soil samples increases rapidly. Besides, combined with a large number of UCS tests, the empirical equation for predicting the performance properties of cement-solidified diesel contaminated soil in high compatibility with the actual test is fitted. This provides a theoretical basis for the actual engineering in the future reuse of diesel-contaminated silty clay.