The utility model particularly relates to a centralized control type key authorization management system. The centralized control type key authorization management system is characterized by comprising an operation and maintenance server, an operation and maintenance main control computer, and a plurality of controlled substation units, wherein the operation and maintenance server, the operation and maintenance main control computer and the controlled substation units are connected through a connecting network; each controlled substation unit comprises an intelligent key management all-in-one machine and a mechanical key management machine. The centralized control type key authorization management system provides a hardware architecture applicable for overall key management.