Intelligent manufacturing driven by the revolution of intelligent technology represents the unequivocal choice for promoting the construction of manufacturing power in the new era. By replacing human labor with industrial intelligent agents and adopting the single-factor virtual-real fusion production mode of "workshop intelligent agent + mirror network", intelligent manufacturing will bring vastly different production characteristics and cost attribute compared to traditional manufacturing, thereby changing the form of the cost function. Comparative research found that intelligent manufacturing exhibits attribute of "high fixed cost and weak variable cost", leading to the derivation of a weak cost function that grows weakly with output, along with the corresponding declining law of marginal cost. The declining law of marginal cost in intelligent manufacturing mainly stems from the diluting and weakening effect of the single-factor virtual-real fusion production mode on variable cost. From the policy perspective, it is recommended to orderly carry out the crowdfunding construction mode of intelligent manufacturing system, actively promote the capacity sharing mode of intelligent manufacturing system, plan a brand-new employment mode for industrial workers in the intelligent era as soon as possible, and vigorously guide consumers to constantly intervene in production activities, so as to realize the identity transformation of consumer into “pro-consumer".