The invention relates to the technical field of glass deep processing, and discloses a glass grinding rate offline measuring apparatus and method. The grinding rate offline measuring apparatus comprises a base plate, at least two support plates, positioning devices, and a plurality of measuring assemblies; the at least two support plates are arranged on the base plate at intervals and used for supporting glass; the positioning devices are arranged on the base plate and used for positioning of a first edge and a second edge adjacent to each other, of the glass; and the measuring assemblies are arranged on the base plate and used for positioning of two ends of a third edge and two ends of a fourth edge of the glass and measurement of the grinding rates of the four edges of the glass, and the third edge and the fourth edge are respectively parallel to the first edge and the second edge. According to the apparatus and method, the grinding rates of the four edges of the glass are simultaneously measured through the plurality of measuring assemblies, the operation is convenient, the time is saved, measuring errors generated by multiple times of measurement are avoided, and the accuracy of measuring results is improved.