What do you mean by “my website’s ranking”?
If you mean where your site appears in search results, then each page is treated separately, and is assessed separately for each search query. So your site may have an excellent page on blue widgets, which ranks very highly in search results, and a mediocre page on green whatnots that only appears a long way down in the results. The position of one page does not influence the other.
Search engines do not “rank” sites; they try to return the search results which most closely match the query.