The invention discloses a unit consumption monitoring method for a product production line, which relates to the technical field of energy consumption management, and solves the technical problem of energy waste reduction. The method comprises the following steps of calculating the unit consumption reference values of various products produced by the production line by utilizing the no-load energyconsumption of the production line and the production energy consumption when the production line is independently put into to produce each product; periodically monitoring the production line, calculating the unit consumption real-time value of the product with the highest yield in each monitoring period, and judging whether the unit consumption of the production line exceeds a limit or not according to the calculated value. The method provided by the invention is suitable for monitoring the energy consumption of the production line for producing various products.