Highlights　What　are　the　main　findings?　Proposes　a　systematic　solution　for　motion　planning　in　dual-robot　collaborative　grinding　and　polishing　systems,　experimentally　validating　its　effectiveness.　Integrates　the　＂handshake＂　method　with　the　seven-point　calibration　approach　via　a　dual-robot　pose　constraint　model,　boosting　spatial　mapping　accuracy.　What　is　the　implication　of　the　main　finding?　Offers　a　reliable　solution　for　industrial　dual-robot　collaborative　grinding　and　polishing　tasks,　improving　operation　accuracy　and　efficiency.　Provides　a　reference　for　kinematic　modeling　and　calibration　of　other　multi-robot　systems,　promoting　the　development　of　robotic　collaborative　technologies.Highlights　What　are　the　main　findings?　Proposes　a　systematic　solution　for　motion　planning　in　dual-robot　collaborative　grinding　and　polishing　systems,　experimentally　validating　its　effectiveness.　Integrates　the　＂handshake＂　method　with　the　seven-point　calibration　approach　via　a　dual-robot　pose　constraint　model,　boosting　spatial　mapping　accuracy.　What　is　the　implication　of　the　main　finding?　Offers　a　reliable　solution　for　industrial　dual-robot　collaborative　grinding　and　polishing　tasks,　improving　operation　accuracy　and　efficiency.　Provides　a　reference　for　kinematic　modeling　and　calibration　of　other　multi-robot　systems,　promoting　the　development　of　robotic　collaborative　technologies.Abstract　This　study　proposes　a　systematic　solution　to　the　motion　planning　challenges　in　dual-robot　collaborative　grinding　and　polishing　systems,　with　its　effectiveness　experimentally　validated.　By　establishing　a　dual-robot　pose　constraint　model,　this　study　innovatively　integrates　the　＂handshake＂　method　with　the　seven-point　calibration　approach,　achieving　enhanced　spatial　mapping　accuracy　between　the　base　coordinate　system　and　tool　coordinate　system.　Based　on　the　modified　Denavit-Hartenberg　(DH)　method,　this　study　establishes　kinematic　modeling　for　EPSON　C4-A901S　robots　on　the　MATLAB　platform.　By　integrating　calibration　parameters,　a　dual-robot　collaborative　grinding　model　is　constructed,　with　its　reliability　thoroughly　verified　through　comprehensive　simulations.　An　experimental　platform　integrating　dual　EPSON　C4-series　robots　with　grinding　devices,　clamping　fixtures,　and　drive　systems　was　established.　The　average　error　below　8　mm　from　10　repeated　experiments　fully　validates　the　accuracy　and　practical　applicability　of　the　integrated　calibration　method.