The invention provides a leaking stoppage device and relates to the technical field of geotechnical engineering. The leaking stoppage device comprises a supporting assembly and a blocking assembly. The blocking assembly is used for blocking a leaking port. The supporting assembly is connected with the blocking assembly and supports and fixes the blocking assembly. By means of the leaking stoppagedevice, the technical problem that in the prior art, blocking by adopting a traditional method fails to achieve a blocking effect is solved. According to the leaking stoppage device provided by the invention, the blocking assembly blocks the leaking port through supporting of the supporting assembly, operation is easy, blocking is convenient, in addition, the leaking port can be blocked, and the situation that the leaking stoppage device is damaged by the excessively large water pressure and the large impact is avoided.