With the increasing penetration of renewable energy sources in distribution networks, the node voltage crossing limits caused by distributed generation (DG) has brought a very big challenge to the operation and scheduling of distribution networks. Therefore, this paper constructs a parallel control system for distribution network to guarantee the safe and reliable operation of the actual distribution network system. Firstly, we build an equivalent digital twin of the actual distribution network system based on NI PXI controller; then, proposes a centralized distribution network scheduling model based on second-order cone optimization, and coordinates the centralized optimization model based on the digital twin to determine the best voltage control strategy for the actual distribution network system through computational experiments and evaluation; secondly, improves the voltage control ability of the distribution network by parallel execution and coordinated optimization between the constructed artificial system and the actual system; finally verifies the feasibility and significant advantages of the parallel voltage control system for distribution networks by using the IEEE33 distribution network system as an example.