The invention provides a conveying device for a material box. The conveying device is used for performing heat treatment on materials placed in the material box and comprises a base, a clamping disc,a front fork mechanism and a conveying chain device, wherein the material box comprises an accommodating cavity, lifting rings and a handle; the front fork mechanism comprises at least two clamping frames, each clamping frame is provided with at least two grooves which are formed in the front end and the rear end respectively, the grooves are used for cooperating with the lifting rings to fork thematerial box into and out of a heating furnace; the conveying chain device comprises a driving mechanism, a chain transmission mechanism and hooks; the hooks are connected to the chain end part of the chain transmission mechanism, and are used for hooking the handle; the driving mechanism drives the chain transmission mechanism to rotate so as to lower or raise the hooks to convey the material box into or out of a quenching tank. The conveying device can complete the heat treatment process of materials, and reduce too complicated conveying processes.