The invention relates to the technical field of logistics, in particular to a mechanical calcium-plastic box stacking method and device. According to the mechanical calcium-plastic box stacking method and device, a conveying device is used for storing well-arranged calcium-plastic boxes, half layer of calcium-plastic boxes is stored each time, a moving device pushes the calcium-plastic boxes stored on the conveying device to a layer moving supporting plate of a layer moving device after each half layer of calcium-plastic boxes is stored, and the layer moving supporting plate moves towards the interior of a stacking device after the layer moving supporting plate is loaded with a whole layer of calcium-plastic boxes; a stopping mechanism at the front end of the stacking device falls down to limit the front end of the calcium-plastic box layer to make the calcium-plastic box layer aligned; the calcium-plastic box layer is clamped by sorting mechanisms at the two ends of the stacking device to further be aligned; a stopping mechanism at the rear end of the stacking device falls down, the layer moving device is pulled away from the stacking device, and then the calcium-plastic boxes stay on a tray or a well-stacked calcium-plastic box layer so that one layer of stacking can be achieved. The mechanical calcium-plastic box stacking method and device enable automatic stacking of the calcium-plastic boxes to be achieved, are capable of relieving the labor intensity of operators and operating stably, and are low in cost and convenient to maintain.