The invention relates to a metering device of packing machine, concretely a shutter-style multiple row synchronous metering device used in multiple row simultaneity metering and packing. It includes hopper with scraping flitch, metering plate and closing plate set in sequence under the hopper, the hopper and scraping flitch are jointed as one body. The aforementioned scraping flitch, metering plate and closing plate are all with elongated slot of equal-width and equal-distance, one side of the scraping flitch and closing plate is respectively connected with air cylinder, a slide mechanism is set in the elongated slot of the metering plate. Compared to the present technology, the invention has simple structure, can implement multiple row synchronous metering during the packing procedure, the metering scope is great and can fix on the amount of the materials by adjusting the slide position for the invention employs regulable link slide block structure in the metering plate, evades the extrusion and damnification from the machine itself to the materials for the integrated structure and bulk movement of the hopper and scraping flitch, diminishes the fine material content of the materials, also evades material pollution and improves quality of the materials.