He has served as farm worker of Yellow River Farm in Kenli County, monitor of an artillery regiment of China People's Liberation Army, confidential officer of People's Armed Forces Department, worker of hydropower section of Jinan Railway Branch, assistant engineer and engineer of Jinan Railway Bureau, assistant dean of Jinan Railway Survey and Design Institute, deputy director of Jinan Foreign Economic and Trade Commission, deputy secretary and director of Party Committee, and economic business counselor of China Embassy in Guyana. Deputy Director of Shandong Foreign Trade and Economic Cooperation Department and member of the Party Group.

In March 2009, he served as inspector of Shandong Foreign Trade and Economic Cooperation Department.

In June 2009, he served as inspector of Shandong Provincial Department of Commerce.

On February 27th, 20 13, the Shandong Provincial People's Government decided to remove Meng Jianxin from the post of inspector of Shandong Provincial Department of Commerce.