Large-diameter pipe orifice butt joint device

The utility model provides a large-diameter pipe orifice butt joint device which comprises a plurality of preliminary fixing pieces and a fine adjustment assembly, and the two ends of each preliminary fixing piece are connected with the inner walls of two pipelines respectively. The fine adjustment assembly comprises a fixing block, one end of the fixing block is fixedly connected with the inner wall of one pipeline, a nut is fixedly arranged on the side, facing the other pipeline, of the fixing block, a screw is in threaded connection with the nut, and a rotating assembly facilitating rotation of the screw is arranged at the end, away from the inner wall of the pipeline, of the screw. The problem that in the prior art, when a large-diameter pipeline with the diameter being 2 m or larger is assembled and welded, the relative position of the opposite opening of the pipeline is difficult to adjust is solved. 本实用新型提供了一种大口径管口对接装置，包括初步固定件以及精调组件，初步固定件为多个，每一初步固定件的两端分别与两管道的内壁连接；精调组件包括：固定块，固定块的一端与其中一个管道的内壁固定连接，固定块朝向另一