先拉取old_branch最新代码到本地

git checkout old_branchgit pull origin old_branch

本地修改后并推送

git branch -m old_branch new_branch  # 修改分支名称git push --delete origin old_branch  # 删除在远程的老分支

推送新分支

git push origin new_branch

本地分支与远程分支相连

git branch --set-upstream-to origin/new_branch