Disclosed is a multi-array detector module structure pertaining to the technical field of radiation detecting. The multi-array detector module structure comprises a casing, a bottom plate to which a bottom end of the casing is fixedly connected, and a multi-array detector composed of a plurality of detectors, wherein a mounting frame is disposed on the bottom plate, and the mounting frame includes an upper plate and a lower plate. The multi-array detector comprises two rows of peripheral detector arrays fixed to the upper plate and the lower plate of the mounting frame, respectively, and at least one row of middle detector array disposed between the two rows of peripheral detector arrays and fixed to the same. Heavy metal sheets are provided between respective detector arrays in respective rows of detector arrays, for reducing cross talk. Furthermore, heavy metal plates are provided between the two rows of peripheral detector arrays and the upper plate and the lower plate of the mounting frame, respectively, for reducing diffusion. Compared with the prior art, the present invention can achieve remarkable economic benefit by slightly improving the structure with low investment. The present invention further has advantages of a simple structure and convenience in installation and maintenance.