The utility model relates to the technical field of weighing and sorting, in particular to a weight
grading scale with a
metal detection function, which is provided with a rack, the rack is provided with a controller, a driver and a conveying chain, the conveying chain is provided with an object containing table, the object containing table is provided with a
metal coil, and the front end and the rear end of the object containing table are provided with
metal contact points. The metal coil is electrically connected with the metal contact point, the rack is provided with a metal
signal plate matched with the metal contact point, the metal
signal plate is electrically connected with the controller, and the metal coil, the metal contact point, the metal
signal plate and the controller are arranged to form a
magnetic field detection device for detecting the'mud shell 'oysters, so that the'mud shell' oysters can be quickly identified and removed; and the sorting efficiency and the sorting accuracy are improved.