Modularized rack-mounted server convenient to assemble

An auxiliary mechanism comprises a movable groove, a clamping groove, a clamping plate and an inserting groove, the movable groove and the clamping groove are both formed in a rack-mounted server body and are both communicated with a groove, an elastic assembly is fixedly connected to the interior of the movable groove, and the clamping plate is fixedly connected with the clamping groove. The elastic assembly is fixedly connected with an insertion plate, the outer surface of the insertion plate is matched with the interior of the insertion groove, the insertion groove is formed in the bottom of the cover plate, and the interior of the clamping groove is matched with the outer surface of the clamping plate. According to the modular rack-mounted server convenient to assemble, under the cooperative use of the movable grooves, the clamping grooves, the clamping plates, the inserting grooves, the elastic assemblies and the inserting plates, the problems that an upper box cover of an existing rack-mounted server is