The invention relates to a sealing structure for a detachable shield machine, which solves the technical problem that during a design process of an assembled small shield machine, a sealed environmentis not easily formed in the shield machine. The sealing structure comprises a front shield assembly module, a middle shield assembly module, a tail shield assembly module and a main bearing which aremounted together; an embedded rotary sealing structure and at least two first annular sealing rings are formed at a joint of the main bearing and the front shield assembly module; the embedded rotarysealing structure is arranged between two first annular sealing rings; a connecting flat surface for forming multiple bolt holes is formed on an assembly connecting surface of each petal block, whentwo adjacent petal blocks are assembled together, a second sealing ring is further arranged between the two petal blocks, and the second sealing ring is used for enclosing the connecting flat surface,so that all the bolt holes in the assembly connecting surfaces of the petal blocks are arranged within the second sealing ring. A sealed environment can be formed in the small assembled shield machine.