The invention provides a red clay court durable line manufacturing method and relates to indoor and outdoor clay courts or sandy courts, mainly applied to building tennis courts, gateball courts, softball courts and baseball courts. According to the red clay court durable line manufacturing method, the lines molded by casting are fixed on the built red clay or sandy courts by processes of positioning on site, grooving, soil borrowing, groove insetting, making protective guard edges, fixing and connecting by wires, pouring linear grooves with PU(silicon PU or polyurethane ), trimming, drawing lines, thereby forming the field lines, which are durable and capable of resisting to tread, press, deformation and abrasion, having elasticity similar to that of the courts, solving the problems thatexisting clay or sandy court lines are unsharp and irregular, need to be drawn frequently and are difficult to maintain, and keeping clear and attractive and being popular to tennis enthusiasts.