请教高手Excel文件双面打印，要求页码在外侧如何设置？

用宏解决吧。确保默认打印机正确。
同时按Alt和F11进入宏界面，点菜单的插入，模块，粘贴如下代码：
Sub test()
Dim i As Byte
For i = 1 To (ActiveSheet.HPageBreaks.Count + 1) * (ActiveSheet.VPageBreaks.Count + 1) Step 2
ActiveSheet.PageSetup.RightFooter = "&P"
ActiveSheet.PrintOut from:=i, To:=i
Next i
MsgBox "请去打印机处反过来放入打印好的纸，然后回来按OK", vbOKOnly, "Hi"
For i = 2 To (ActiveSheet.HPageBreaks.Count + 1) * (ActiveSheet.VPageBreaks.Count + 1) Step 2
ActiveSheet.PageSetup.LeftFooter = "&P"
ActiveSheet.PrintOut from:=i, To:=i
Next i
End Sub

在此界面下直接按F5，OK。

转换成pdf格式，用pdf真正打印。