Display screen online detection device

The invention discloses a display screen online detection device, which comprises a detection box (1), a transmission device (2), a detector (3), a support structure (4) and a base (5), wherein the detector (3) is arranged in the detection box and is a laser detection scanner (3); the detection box (1) is mounted above the transmission device (2) and covers the transmission device (2); the transmission device (2) stretches across the two sides of the whole detection box (1) and comprises a long support (15), a left transmission roller (14), a right transmission roller (14), a transmission motor (10) and a conveying belt (9). The transmission rollers at the left end and the right end are sleeved with the conveying belt, and the laser detection scanner (3) is arranged in the middle of the interior of the detection box (1) and conducts laser scanning detection on the display screen conveyed by the conveying belt (9); the supporting structure (4) is correspondingly arranged below the conveying belt below the dete