使用VBA宏：在Excel中按下“Alt+F11”打开VBA编辑器，编写VBA宏代码，实现自动合并多个Excel文件的数据。

好的，这是一个很好的问题。以下是一个简单的VBA宏代码，可以自动合并多个Excel文件的数据：

Sub MergeExcelFiles()
Dim path As String, fileName As String, sheet As Worksheet, total As Integer
Dim r As Range, i As Integer, j As Integer, k As Integer, l As Integer

path = "C:\Users\username\Documents\Excel Files\" '修改为你的文件夹路径
fileName = Dir(path & "*.xlsx")
Do While fileName <> ""
Workbooks.Open fileName:=path & fileName, ReadOnly:=True
For Each sheet In ActiveWorkbook.Sheets
total = Workbooks("Merged.xlsx").Worksheets.Count
For i = 1 To total
If sheet.Name = Workbooks("Merged.xlsx").Worksheets(i).Name Then
sheet.Delete
Exit For
End If
Next i
sheet.Copy after:=Workbooks("Merged.xlsx").Sheets(total)
Workbooks("Merged.xlsx").Sheets(total + 1).Name = sheet.Name
Next sheet
Workbooks(fileName).Close
fileName = Dir()
Loop

For j = 1 To Workbooks("Merged.xlsx").Worksheets.Count
Set r = Workbooks("Merged.xlsx").Worksheets(j).Range("A1")
For k = 1 To r.CurrentRegion.Columns.Count
For l = 1 To r.CurrentRegion.Rows.Count
If r.Offset(l, k - 1) = "" Then
r.Offset(l, k - 1) = r.Offset(l - 1, k - 1)
End If
Next l
Next k
Next j
End Sub

请注意，此代码假定您的Excel文件都在同一个文件夹中，并且您已经创建了一个名为“Merged.xlsx”的空工作簿，以便将所有数据合并到其中。如果您的文件夹路径或工作簿名称不同，请相应地修改代码。