1June, 942, joined the Eighth Route Army. In the same year, in the process of reclamation and production self-help in Yushan, he worked hard and worked hard, picking dung up the mountain and carrying firewood down the mountain, and also drove his comrades to dig hard. After being tired, the company commander forced him to rest, and secretly cultivated land in remote places to improve the lives of his comrades. Often use the rest time to help the chef carry water and cut wood; When comrades-in-arms are sick, they take time to go up the mountain to collect firewood and burn kang for patients; On a cold winter night, I got up for half a night to chop wood and make a fire, so that my comrades could fall asleep warmly. Because of his outstanding achievements, he was rated as a model worker of the brigade. In the big training campaign, he set an example, practiced his assassination skills hard, and stabbed 1300 guns without changing his face, becoming a model monitor of the whole battalion.

1944, participated in the battle of Xiangyang county. The trench of the enemy stronghold is 1 ft deep and 2 ft wide, and the trench is chest deep. Wang Caichun resolutely jumped out of the ditch, shouldered the wooden bridge, and let his comrades set foot on the bridge to successfully complete the task. In the battle of Zhaoyuan Qigezhuang, the enemy's artillery fire was extremely fierce. He resolutely lifted the bridge, paved the boards and completed the task of building the bridge in time. In more than a dozen battles before and after, he successfully completed the 13 bridging task and won the title of "bridging hero" in the whole battalion.

Shijiatuan fought and the whole platoon was surrounded by the enemy. Wang Caichun was not surprised by the danger, calmly shot, missed one shot, and killed six enemies; And killed the enemy battalion commander, all of deus ex. In the battle with Zhao Baoyuan, a stubborn Kuomintang army, in February 1945, Wang Caichun's company broke into the enemy's position and was attacked by the enemy crazily. They held their ground, fought bloody battles and repelled the enemy's attacks several times. In the fierce battle, Wang Caichun died unfortunately. The director's office of Jiaodong District Administrative Office decided to rename his hometown as Dazhuang Cai Chunbo; The command of Jiaodong Military Region ratified Wang Caichun as a special model worker.