here the answer:

<script type="text/javascript">
    function hideEdit() {
        var edit = document.getElementById("Ribbon.ListForm.Display.Manage.EditItem-Large");
        edit.style.display = "none";
    }       
    _spBodyOnLoadFunctionNames.push("hideEdit");
</script>

Or

Enable/Disable ribbon button based on current item value of a field

here the answer:

<script type="text/javascript">
    function hideEdit() {
        var edit = document.getElementById("Ribbon.ListForm.Display.Manage.EditItem-Large");
        edit.style.display = "none";
    }       
    _spBodyOnLoadFunctionNames.push("hideEdit");
</script>

Or

Enable/Disable ribbon button based on current item value of a field