The invention relates to a split-type multifunctional deep hole drilling machine. The split-type multifunctional deep hole drilling machine comprises a mechanical power part, an adjustable worktable for a heavy workpiece, a telescopic correction bridge, an inner chip removal hydraulic part and an electric appliance part. By considering the characteristics of the workpiece such as large weight, eccentric deep holes, irregular appearance and particularity of materials, and by sufficiently utilizing the technical advantages of deep hole boring (drilling) and gun drilling, a novel multifunctional deep hole machining device which is more practical is developed and designed.