The influence of spin-polarized current injection (SPСI) on the critical current and the resistive state of Pb microbridges at the passing of transport current through the Pb film is investigated in the absence of an external magnetic field. As found, the SPСI effectively influences on the critical current of superconducting Pb microbridges. The effect of increasing of the critical current of superconducting Pb microbridges is detected. As established, the SPСI is a convenient external parameter, which changes the value of the cut-off current. As ascertained, the dynamical resistance of the phase-slip lines increases with the increase of SPСI level.