The invention discloses a textile back cover coating containing a star-shaped block polymer as well as a preparation method of the textile back cover coating. The textile back cover coating containingthe star-shaped block polymer is prepared from the following components: filler, resin, the star-shaped block polymer, a dispersing agent and a defoaming agent. The star-shaped block polymer is addedinto the textile back cover coating, so that the flaws of textile fabric base can be covered up, and the cohesion and adhesive force of the textile fabric base are improved while the textile fabric base is enabled not to leak material.