The invention discloses a cable blind sample manufacturing device for testing. The device comprises an automatic pay-off part, an identification position detection part, a spraying part and an automatic take-up part, wherein the automatic pay-off part and the automatic take-up part are driven by a motor, and a to-be-tested cable keeps certain tension between the automatic pay-off part and the automatic take-up part; the identification position detection part is arranged between the automatic pay-off part and the automatic take-up part and used for detecting the starting point and the end pointof a detection identifier; the spraying part starts spraying or stops spraying according to a detection result of the identification position detection part. According to the device, a blind sample of an outer cable sample can be manufactured efficiently at low cost, the labor resource cost is reduced, the situation that manually manufactured blind samples are not sufficiently sprayed or even missing spraying occurs is eliminated, and the phenomenon that quality of the blind samples is not uniform due to the fact that a manual manufacturing technology is uncontrollable is eliminated; meanwhile, winding of the sample with the manufactured blind sample can be standard and meets testing requirements.