Fixable telescopic water-saving toilet cleaning liquid containing and self-flowing device for closestool

The invention relates to a fixable telescopic water-saving toilet cleaning liquid containing and self-flowing device for a closestool, which comprises a liquid injection pipe, a flow equalizing control pipe, an inner barrel, an outer barrel, a first rubber ring, a fixable telescopic module and a liquid outlet control module. The liquid injection pipe is communicated with the inner barrel, the inner barrel is of a bottom-surface-free structure, and the inner barrel is nested in the outer barrel; wherein the first rubber ring is arranged between the outer cylinder and the inner cylinder to forma volume-variable container, toilet cleaning liquid is contained in the container, the flow equalization control pipe is inserted into the liquid injection pipe and extends to the position below the liquid level of the toilet cleaning liquid, the fixable telescopic modules are symmetrically distributed on the left side and the right side of the outer cylinder, and the liquid outlet control moduleis located on the lower po