First import from Git as a general single project.
Then: For each module in the project do the following:
1- Right-click on the sub-project
2- Import as an existing maven project
3- Click Finish!
4- Enjoy!
参考:
https://haythamsalhi.wordpress.com/2016/01/25/how-to-import-multi-module-maven-project-into-eclipse-from-git/