Magnetic flux leakage detector floating cup device

The utility model provides a floating cup mechanism of a pipeline magnetic leakage corrosive detector which detects the metal loss degree of a pipeline on line. A cup (4) is fixed on a floating mechanism, the floating mechanism consists of a cup floating plate (5), a cup floating frame end plate (6), a cup floating frame (8), a screw (9), and a screw (10); the ring-shaped cup floating frame (8) is connected with the cup floating frame end plate (6) through a plurality of screws (10), a ring-shaped gap is left between the cup floating frame (8) and the cup floating frame end plate (6), the ring-shaped cup floating plate (5) is clamped in the gap and forms loose fit, the cup (4) is clamped between a cup pressing disc (3) and the outer edge of the cup floating plate (5) and fixed by a plurality of studs (1) and locking nuts (2), and the floating mechanism is fixed on a detector body by a plurality of screws (9) and screws (10). The utility model can enhance the through capacity of the detector in a pipeline; the cup (3) not only can provide enough driving force, but also can be overturned when detector is clipped, and the dynamic characteristic of the detector is improved.