The invention discloses a mechanical grasping device for an industrial robot, comprising a distribution box, a PLC controller, a first motor, a first hydraulic pump, a hanging plate, a turning frame, a grabbing plate, a second hydraulic pump, a hydraulic warehouse, The first hydraulic column, the first rolling gear, the second motor, the second rolling gear, the loading plate, the working chamber, the grabbing arm, the grabbing foot, the camera, the second hydraulic column, the third hydraulic column, the wire and the piston groove. The beneficial effect of the present invention is that: the first hydraulic column is driven to move forward and backward by the first hydraulic pump. Moreover, the motor drives the first hydraulic pump to turn up and down through the first rolling gear, so as to ensure that the grabbing plate of the device moves faster and more flexibly, and it is more convenient to grab industrial products, and the efficiency of grabbing and conveying is higher. When the grabbing arm grabs the object, the grabbing foot blocks the product, so that the device grabs the product and moves more firmly; the device has a high degree of automation when it works, and does not need manual control, saving time and effort when using it; the device is easy to operate, The components are connected flexibly.