The utility model discloses a road bed repair system that collapses based on assembly type component, be used for supporting precast beam plate's precast concrete pile including precast beam plate inthe district with establishing caving in, precast beam plate including be used for with the left side collapse board I that the road surface links to each other and be used for with the right side board II that the road surface links to each other that collapses, board I and board link to each other through unsmooth cooperation structure between II, the utility model discloses can effectively reduce the prosthetic time of road bed, improve the stability and the security of restoreing the road bed, its construction is simple moreover, the quality is controllable.