This utility model relates to a detachable multi-cavity lunchbox, comprising a box body and a lid. A first recessed groove is recessed at the upper right corner of the box body. A second recessed groove is located in front of the first recessed groove on the box body. A third recessed groove is located between the left sides of the first and second recessed grooves on the box body. A fourth recessed groove is located behind the third recessed groove on the box body. In this utility model, the recessed compartments can be used together with the box body as a mother-
daughter box or used independently, increasing the versatility of the lunchbox in different scenarios. Users can choose the number and combination of compartments to carry according to their actual needs, meeting their dining needs in different occasions. In this embodiment, the four recessed compartments are designed with different shapes and sizes to meet the needs of holding different types of food. The size and shape of each compartment complement each other, making the overall structure of the lunchbox compact and the space utilization more rational.