The present invention provides a service type auto-negotiation method and an aggregation device. The method comprises: comparing a service type capability set of a local device with that of a peer device to select a communal service type capability set; configuring a service type on an optical transmission network chip using the highest priority service type in the communal capability set; the service type capability sets including various service types supported by the devices and their corresponding priorities. The method negotiates automatically service types supported by both interconnected devices through a protocol and configures device hardware based on the negotiation result such that service interworking can be achieved without network management, thereby greatly decreasing the complexity of service development.