In December 1941, the school was suspended for the Japanese invasion of Malaya and reopened in 1945 after the Japanese occupation of Malaya. At that time, institutions work as a whole（统筹统办）. Jit Sin Primary School and several other schools were under a general term of institution, Chung Hwa School（中华学校）, which had several schools at other locations in a region. For Jit Sin Primary School, it was located at a milk package（牛奶袋） factory in Aston Road（爱斯顿路）, which was behind the Han Chiang Association（韩江会馆） building. Due to the deprivation of education during war time, the education given was free and the number of students was enormous. For Jit Sin branch campus there were over 1000 students. At the end of year 1945, the schools went back to their original modes. Jit Sin Primary School was officially reopened in 1946.