The utility model relates to a container type base flash rail welding integrated device which comprises a steel rail pre-welding straightening and rust removing integrated machine, wherein the steel rail pre-welding straightening and rust removing integrated machine is connected with a flash butt welding machine; the flash butt welding machine is connected with a four-directional straightening machine; the four-directional straightening machine is connected with a numerical-control refiner; and the numerical-control refiner is connected with a welding line imaging flaw detector, so that the pre-welding preparation of steel rails, the flash butt welding and the post-welding accurate restoration and depth detection of welding joints can be completed. According to the utility model, the rapid, efficient, excellent and safe steel rail welding can be realized.