Internally C-buckled combination device including a base, a working kit and a C-shaped buckle ring, and is easy for dismantling

The invention provides an internally C-buckled combination device and a dismantling method thereof. The internally C-buckled combination device includes a base, a working kit and a C-shaped buckle ring. The base includes an inner surface and an outer surface oppositely disposed. The inner surface surrounds and defines an accommodating space and has an embedding ring groove which circumferentially surrounds and communicates with the accommodating space. The outer surface has at least one through hole communicated with the embedding ring groove. The working kit is arranged on the base. The C-shaped buckle is configured to be elastically arranged in the embedding ring groove and is used to prevent the working kit from leaving the accommodating space. The C-shaped buckle covers at least a part of the through hole. When an external force acts on the C-shaped buckle through the through hole, the C-shaped buckle is elastically deformed toward the accommodating space and produces an insertion gap.