A device and method for measuring a blind mating connector interfitting gap, comprising: calibration tooling (1) which is provided thereon with a groove (11), the depth S of the groove (11) being a partial pin length of a signal pin on a backplane connector for docking with a machine disk connector plus the thickness of the casing bottom of the backplane connector; and a simulation machine disk (2). The simulation machine disk (2) comprises: a disk body (21); a plurality of machine disk connectors which are each fixed on the disk body (21); at least one displacement sensor (22) which is fixed on the simulation machine disk (2) and arranged adjacent to one machine disk connector, the length of a part of the displacement sensor (22) that protrudes from the simulation machine disk (2) beyond the machine disk connector being slightly greater than the depth S; and a displacement tester (23) which is connected to the displacement sensor (22) and used for reading data of the displacement sensor (22). The device for measuring the blind mating connector interfitting gap may avoid the problem of poor measurement data consistency caused by multiple measurements and multiple calculations, and is not limited by the test conditions. The entire test tooling is simple and easy to operate, has high testing efficiency and high testing accuracy.
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