The invention provides a mortar and coating powder production line. An gray cement tank and a fine sand tank are introduced into a white production line, so that the white production line can produce white JS powder and can also produce gray PMC powder. On one hand, the product categories of production can be flexibly adjusted according to the production demands, so that the production plan cannot be limited by equipment factors; on the other hand, the white production line and a gray production line can be utilized to simultaneously produce the gray PMC powder, therefore the problem of insufficient production capacity of the gray production line is relieved, and the production capacity of gray coating powder of the whole mortar and coating powder production line is increased; moreover, the gray production line can be utilized to produce gray mortar or PMC426 powder, the white production line can be utilized to produce gray PMC powder, therefore the problem of production conflict of gray ceramic tile adhesive (or the PMC426 powder) products and gray PMC powder products is solved, and the production efficiency and the production flexibility are improved.