A static rigidity and static strength testing system of an automobile axle casing comprises a displacement sensor. The output end of the displacement sensor is connected with a computer through a concentrator, the displacement sensor is arranged at the corresponding measurement position of the axle casing through a displacement sensor installation support, a strain gauge is bonded to the position of the axle casing where stress is large, the strain gauge is connected with the input end of a strain measuring instrument, and the output end of the strain measuring instrument is connected with the computer. Test software is configured in the computer. In test, the displacement sensor measures displacement quantity of corresponding measurement points of the axle casing under control of the test software, the displacement quantity is transmitted to the computer through a data line and the concentrator, and manual errors caused by manual reading are avoided. Simultaneously, the strain measuring instrument collects variation of strain bridge circuit voltage to obtain a strain value, strain data are transmitted to the computer through a strain measuring instrument cable, displacement measurement and strain measurement are finished in one system, test complex degree is reduced, and the static rigidity and static strength testing system is convenient to operate.