The invention relates to a monitoring device. A monitoring device main body comprises a set of product transmission weighing device and a control cabinet, wherein the control cabinet is positioned below the transmission weighing device; the control cabinet comprises an industrial personal computer PC; the industrial personal computer PC is connected with a DC 24V power supply switch, is connected with an I/O data module I and an I/O data module II, and is also connected with a die cavity temperature measurement infrared probe; an operation working table is arranged on the upper surface of the control cabinet; a displayer connected with the industrial personal computer PC is installed right above the operation working table; a barcode printer is installed at the sidepiece of the operation working table; and a data statistics module, a drawing function module and a data management module are inlaid in the industrial personal computer. A 6sigma method is fused, labor cost is reduced greatly, according to the operation method, the technology popularization is strong, defective products are prevented from being put in storage, first-pass yield of products is ensured, meanwhile, the production efficiency is improved simultaneously, the rejection rate is reduced, and guarantee is provided for improving the production efficiency.