A　polymethionine　(p-Met)-modified　laser-induced　graphene　(LIG)　electrode　(p-Met/LIG)　was　constructed　and　integrated　with　a　portable　electrochemical　workstation　and　handheld　computer　application　to　achieve　simultaneous　on-site　detection　of　environmental　water　bodies.　Among　the　azo　dyes　are　sunset　yellow　(SY)　and　tartrazine　(Tz).　The　laser　processing　parameters　were　optimized　to　prepare　a　sensing　interface　with　the　best　conductive　properties;　Met　was　electropolymerized　on　the　LIG　surface　to　improve　the　electrochemical　response　of　SY　and　Tz;　by　combining　p-Met/LIG　portable　electrochemical　sensors　and　small　electrochemical　workstations　Integrated　with　a　handheld　computer　application,　a　portable　electrochemical　sensing　platform　was　built　for　detecting　SY　and　Tz.　Differential　pulse　voltammetry　(DPV)　was　used　to　measure　the　two　dyes,　and　the　linear　range　of　detecting　SY　was0.2-20　mu　mol/Land　20-100　mu　mol/L.　The　detection　limit　is　as　low　as0.001　mu　mol/L;　The　linear　range　of　detecting　Tz　is0.3-40　mu　mol/L　and40-100　mu　mol/L.　The　detection　limit　is0.005　mu　mol/L.p-Met/LIG　has　excellent　anti-interference　performance,　stability　and　reproducibility.　This　portable　sensing　platform　was　used　for　actual　water　sample　detection,　and　the　results　showed　that　this　platform　is　suitable　for　real-time　on-site　detection　of　SY　and　Tz　in　actual　environmental　water　bodies