Crack plugging and tracing system, and preparation method and application of microcapsule

The invention belongs to the technical field of crack repairing. The invention provides a crack plugging and tracing system, and a preparation method and application of microcapsules. The first reaction microcapsules and the second reaction microcapsules are released and react after being broken under the stress generated by the cracks, and reactants are filled in the local cracks to block the diffusion of the cracks. Core materials of the tracing microcapsules have certain salt content resistance and ultraviolet decomposition capacity, fluorescence tracing can be conducted on the expansion track of the cracks under an ultraviolet lamp so that the corrosion condition can be known in time, solutions can be taken, and repairing and nondestructive testing of the tower footing concrete cracks can be conducted. The microcapsule prepared through the preparation method is good in forming effect, high in uniformity, high in weather resistance, more concentrated in particle distribution and better in strength, only cr