Plasmonic-based catalysts are capturing widespread attention in the field of electrocatalysis, however, are still facing huge challenges in activity, stability, and mechanism interpretation. Herein, the unique AgPt alloy modified multibranched Au nanostar heterostructures with wider tunable optical properties and desirable activities are precisely fabricated via selective deposition of Ag and Pt. AgPt-tipped Au nanostars have the most remarkable performance in electrocatalytic hydrogen evolution (overpotential of 58 mV at a current density of 10 mA cm(-2)) and methanol oxidation reaction (4.01 A mg(N)(-1)) driven by visible and near-infrared light irradiation, which are mainly ascribed to the effective transfer of plasmon-excited electron-hole pairs. Additionally, the increased system temperature generated by the photothermal effect of Au, larger active area, and modified electronic state also contribute to the enhancement of activity, stability, and tolerance of CO poisoning. As the adverse charge transport pathway, the electrocatalytic performances of AgPt-edged and-covered Au nanostars are inhibited. The experimental results reveal that rationally designed bifunctional plasmonic electrocatalysts which make full use of the synergy of photoelectric, photothermal, and structural effect have promising potential in photoelectric catalytic conversion fields.