The invention discloses a global configuration based multi-tenant dynamic switching data source system. The data source system mainly includes: isolating tenant data according to database rank; sharing a connection pool, wherein the connection number is controllable; supporting a database mapping of a specific tenant or a specific application; monitoring configuration information change in real time, and dynamically adjusting linkage information; solving the problem that similar information of multiple tenants are stored in the same two-dimensional table, and the maintenance difficulty is large; solving the problem that service data is isolated logically, and is not isolated physically; solving the problem that recovery of a database will affect all the tenants while data of a certain tenant is wrong; solving the problem that all the user accesses are affected while a single set database server goes down; solving the problem that a database connection pool is not controllable, and there is no an independent database service for the specific tenant or a specific user; overcoming the defect that a tenant data isolation problem and a connection pool problem cannot be dealt in a simple manner; and the implementation manner of a dynamic data source can be simplified.