The invention discloses a box cover lock for disassembling and assembling a server case without tools, and belongs to the technical field of server case disassembling and assembling devices. The box cover lock comprises a fixed shell, a Drag block, an operation panel, a Connecting plate and a positioning column; the upper end surface of the fixed shell is opened; the fixed shell is arranged on oneside, close to the case body, of the case cover; the open end of the fixed shell is connected with the box cover; an inner cavity of the fixed shell is communicated with an operation hole of the boxcover; a positioning column sliding hole is formed in a bottom plate of the fixed shell; the positioning column sliding hole is matched with the positioning column; the positioning column is connectedwith the case body; the dragging block is in sliding connection with the fixed shell; The dragging block is provided with a positioning hole matched with the positioning column, the operation plate is arranged above the dragging block, one end of the operation plate is hinged to one end of the dragging block, the connecting plate is arranged at the hinged end of the operation plate and the dragging block, one end of the connecting plate is hinged to the middle of the operation plate, and the end, away from the operation plate, of the connecting plate is hinged to the side wall of the fixing shell. Tool-free assembly and disassembly of the case body and the case cover are realized, so that the server case is convenient, quick and labor-saving to assemble and disassemble.