The invention discloses a combined computer host case. The combined computer host case comprises a calculation function cabin, a heat dissipation function cabin and an
extended storage function cabin. The functional cabins are detachably connected through
interconnection frames arranged among the functional cabins, and mechanical
interconnection mechanisms and electrical
interconnection interfaces are arranged on the interconnection frames and used for achieving mechanical fixation, power distribution and
data transmission between the adjacent cabins. Wherein the calculation function cabin is used for accommodating a core calculation part, the heat dissipation function cabin forms an independent power supply cabin and a video card cabin through an internal isolation air duct plate, and the
extended storage function cabin is provided with a hard disk bracket which can be vertically inserted and pulled. The functional cabins are sequentially stacked from bottom to top, and hidden installation and
electromagnetic shielding continuity are achieved through cooperation of the shield structure and the interconnection frame. According to the scheme, the problems of internal heat accumulation, insufficient
electromagnetic shielding effectiveness, difficulty in hardware expansion and maintenance and the like of a traditional integrated case are effectively solved, and the integrated case has the advantages of compact structure,
high heat dissipation efficiency, good
electromagnetic compatibility and convenience in maintenance.