The invention aims at providing a visual early-warning method and system for materials purchasing so that problems in the prior art can be solved and thus visual early warning of materials purchasingcan be realized. A material number and a planned arrival date in a purchasing plan table of a region i are obtained; a material number and an actual arrival date in an arrival list of the region i are obtained; and a material arrival histogram is established for displaying based on an arrival rate V1i of the region i, an un-punctual arrival rate V2i pf the region i, a punctual arrival rate V3i ofthe region i, and a floating rate V4i of the region i. The method and system have the following beneficial effects: visual early warning of material purchasing is realized; and early warning is realized based on the purchasing plan table and the arrival list.