Aiming at the problems of low cost closeness and poor benefit in traditional production line automatic assembly cost control method, an automatic assembly cost control method of Industry 4.0 production line based on deep reinforcement learning is proposed. The assembly cost status is represented by state value function, and the cost data is cascaded by attention model. Based on the analysis of the principle of deep reinforcement learning, a deep reinforcement learning model for automatic assembly cost control of Industry 4.0 production line is constructed by feed forward control, process contr...