Fluid filling device

A fluid filling device, including:

• a covering unit, configured to cover an opening portion, including a first flow channel, the first flow channel configured to be communicated with an interior of the opening portion;
• a quick-connecting member, being tubular, disposed on the covering unit and communicated with the first flow channel;
• and
• a base, including at least one joint, a second flow channel and a connection portion, the at least one joint configured to be assembled with at least one pipe, the second flow channel being communicated respectively with the at least one joint and the connection portion, the connection portion detachably and communicatedly connected with the quick-connecting member;
• wherein the covering unit further includes a lid body, a plug body and an elastic member, the plug body includes a plug head and an axial rod connected with each other, the first flow channel extends through the axial rod and the plug head, and the elastic member is sleeved to the axial rod and abutted against and between the plug head and the lid body so that the plug head has a tendency to move in a direction away from the lid body.