Two-stage modular server chassis structure

A two-stage modular server chassis structure, for installing a computer host and a disk array module separately, and capable of connecting and using the computer host of a different size with the disk array module of a different size according to user requirements, comprising:

• a first chassis, comprising a first lower casing and a first upper casing for installing the computer host therein, and the first lower casing being formed by three first retaining walls continuously surrounding a first bottom panel and having a first assembling portion disposed at the front of the two first retaining walls, and a second assembling portion disposed at the front of the first bottom panel;
• and
• a second chassis, comprising a second lower casing and a plurality of hard disk brackets, for accommodating the disk array module therein, and the second lower casing having a second retaining wall disposed on two sides of a second bottom panel separately, and a rear of the two second retaining walls having a first relative assembling portion configured to be corresponsive to the first lower casing, and a rear of the second bottom panel having a second relative assembling portion configured to be corresponsive to the first lower casing;
• thereby, the two first assembling portions and the two first relative assembling portions, and the second assembling portion and the second relative assembling portion can be used to assemble the first chassis and the second chassis as a whole.