For improving the conditions of single function, low testing precision, complex operation that exists in the tests of leaf spring testing machine, and on the basis of relevant provisions GBT19844-2005 leaf spring, a test bench for leaf spring with multifunction is designed. Through the structure analysis of leaf spring, a structure scheme of test bench named gantry type is put forward, combined with the testing requirements of the national standard and the spring stress characteristics, the hydraulic loading system and PID(Proportion Integration Differentiation) control system is proposed as well. By this test bench, experiments of the leaf spring for "permanent deformation, stiffness, fatigue" and other aspects related can be conducted, with shorter experimental cycle and higher experimental precision.