Yes, it is.
It is a renaissance poem for several reasons. The most basic is when it was written; the author was part of the English Renaissance. Almost as basic, but a bit more substantial a reason, the poem is thought to be an imitation of a sonnet by Petrarch, who was a major writer from the Italian Renaissance. This means it is renaissance in both origin and form.
You could also argue that the Latin section asserting Caesar's authority indicates a rise of secular authority over spiritual, which was part of the renaissance.