The invention discloses a bridge crack damage vector representation mode and a data processing method. The vector representation mode comprises a spatial position of a crack on a beam body, a trend of the crack, the width of the crack, the length of the crack, morphological characteristics of the crack and other auxiliary information. The data processing method comprises the steps of performing standardized vector input on the crack of a bridge, and finally forming a crack vector set; based on a CAD software interface, calling the vector set M in different modes; and establishing a basic ''medical record'' of bridge crack damage, wherein the basic "medical record" comprises a distribution sketch of the crack on the beam body, a development sketch of the crack along with the time, a length change curve of the crack along with the time, a width change curve of the crack along with the time, and a length change curve graph of the crack along with the time. Crack data obtained by an existing bridge detector can be represented in a standardized vector form, so that a computer can store the crack data conveniently; and the advantages of unified standards, convenient input and maintenance, small storage capacity and the like are achieved.