The disclosure provides a method for customizing a security service and device, relates to the field of information security and solves the problem of incapability of an undiversified security service provision manner in meeting requirements of different tenants. The method includes that: a cloud computing data centre acquires at least one security service type selected by a tenant; and the cloud computing data centre executes corresponding security service according to the at least one security service type selected by the tenant. The technical solutions provided by the disclosure are applicable to a cloud computing system, and enables the cloud computing data centre to provide security service according to a requirement of the tenant.