The electron spin conductance switch effect in a two step-likes quantum wire under the modulation of both the Rashba and Dresselhaus spin-orbit couplings (SOCs) is investigated by using the non-equilibrium Green’s function (NEGF) method with tight binding approximation scheme. Results show that a very large spin conductance occurs in the system under consideration when the electrons transport in the forward biased case, while the spin conductance vanishes when the electrons transport in the backward biased case. Moreover, it is found that the spin conductance of the system displays a“circular”profile according to the change of both the Rashba and Dresselhaus SOCs, which demonstrates that the two SOCs have the same effects on inducing spin conductance. Therefore, one can control the spin conductance of the system by tuning either the Rashba or Dresselhaus SOC strength, which indicates that the system can be utilized to make the proposed quantum wire with all-electrical spin conductance diode in the future.