Using　the　electrochemical　technology　to　split　water　molecules　to　produce　hydrogen　is　the　key　to　obtain　green　hydrogen　for　solving　the　energy　crisis.　The　large-scale　application　of　hydrogen　evolution　reaction　(HER)　in　water　dissociation　requires　a　highly　active　catalyst.　In　this　paper,　the　highly　dispersed　PtCo　bimetallic　nanoparticles　loading　on　MXene　(PtCo/MXene)　were　prepared　by　using　a　step-to-step　reduction　strategy.　The　mentioned　PtCo/MXene　catalyst　exhibits　a　high　current　density　of　-100　mA/cm2　in　an　acidic　medium　with　just　a　152　mV　overpotential.　In　addition,　the　PtCo/MXene　catalyst　also　displays　a　superior　stability.　Computational　analysis　and　experimental　testing　demonstrate　that　the　electronic　interaction　between　Pt　and　Co　can　effectively　modify　the　electronic　structure　of　the　active　site,　thereby　enhancing　the　inherent　catalytic　performance　of　the　material.　More　importantly,　MXene　two-dimensional　nanosheets　can　expose　more　active　sites　because　of　their　large　specific　surface　area.　Furthermore,　MXene　substrate　with　excellent　electrical　conductivity　and　harmonious　interfaces　between　PtCo　and　MXene　enhance　charge　transfer　efficiency　and　lower　the　reaction　activation　energy.