A high proportion of distributed generations are connected to the distribution network, which can easily lead to voltage fluctuations and even voltage limit violations, and increase system network losses at the same time. To increase the safety margin of the distribution network and improve the reliability of power supply, this paper proposes a voltage partition control method for the distribution network with DG based on sensitivity clustering. First, power flow calculation is conducted to obtain the Jacobian matrix. Then, calculate the sensitivity of the voltage of each node to the output of the distributed generation, through which the reactive power voltage control space matrix of the DG can be obtained. Then clustering is performed by the K-means algorithm to obtain DG adaptive partition. Finally, according to the sensitivity and partition results, the output of DG and reactive power equipment is adjusted for voltage regulation. Voltage control of this method can perform directional compensation for the weak points of the system voltage, and realize the divisional adjustment of distributed generations. Finally, the IEEE 33-node system is used as an example, and the results show that the voltage control method can effectively improve the system voltage level and improve the power quality.