diff --git a/hutool-core/src/main/java/cn/hutool/v7/core/io/file/FileNameUtil.java b/hutool-core/src/main/java/cn/hutool/v7/core/io/file/FileNameUtil.java
index 0ed9b9d5dd..1b9f87b5fe 100644
--- a/hutool-core/src/main/java/cn/hutool/v7/core/io/file/FileNameUtil.java
+++ b/hutool-core/src/main/java/cn/hutool/v7/core/io/file/FileNameUtil.java
@@ -132,6 +132,28 @@ public class FileNameUtil {
 	}
 	// endregion
 
+	/**
+	 * 重命名文件主名称(不会修改后缀)
+	 *
+	 * @param filePath        文件
+	 * @param newFileMainName 新的文件主名称(不含后缀)
+	 * @return 重命名后的文件名称
+	 */
+	public static String renameMain(final String filePath, final String newFileMainName) {
+		String fileName = getName(filePath);
+		if (StrUtil.isBlank(fileName)) {
+			return newFileMainName;
+		}
+
+		// 如果原始文件名称有后缀则保留
+		final String suffix = getSuffix(fileName);
+		if (StrUtil.isBlank(suffix)) {
+			return newFileMainName;
+		} else {
+			return newFileMainName + "." + suffix;
+		}
+	}
+
 	// region ----- prefix and suffix
 	/**
 	 * 获取文件后缀名，扩展名不带“.”
diff --git a/hutool-core/src/test/java/cn/hutool/v7/core/io/file/FileNameUtilTest.java b/hutool-core/src/test/java/cn/hutool/v7/core/io/file/FileNameUtilTest.java
index 4bfcf65355..33783267b5 100644
--- a/hutool-core/src/test/java/cn/hutool/v7/core/io/file/FileNameUtilTest.java
+++ b/hutool-core/src/test/java/cn/hutool/v7/core/io/file/FileNameUtilTest.java
@@ -63,4 +63,11 @@ public class FileNameUtilTest {
 	public void normalizeBlankTest() {
 		Assertions.assertEquals("C:/aaa ", FileNameUtil.normalize("C:\\aaa "));
 	}
+
+	@Test
+	void renameMainTest() {
+		Assertions.assertEquals("1.pdf", FileNameUtil.renameMain("a.b.pdf", "1"));
+		Assertions.assertEquals("a.pdf", FileNameUtil.renameMain(null, "a.pdf"));
+		Assertions.assertEquals("a.pdf", FileNameUtil.renameMain("", "a.pdf"));
+	}
 }