A bi-pass solar vacuum tube with an expansion joint consists of an outer tube and an inner tube, wherein the outer tube and the inner tube are glass tubes, ports of two ends of the outer tube and the inner tube are connected in a sealed mode, a vacuum cavity is reserved between the outer tube and the inner tube, a heat absorption layer is plated on the outer wall of the inner tube, an inner tube positioning ring and a material preventing the heat absorption layer from being oxidized are installed in the vacuum cavity, two ends of the inner tube are communicated with the outside, a vacuumizing head is machined on the outer wall of the outer tube, and the expansion joint is machined at one end of the inner tube and in a corrugated crumple shape. The peripheral diameter of the expansion joint is basically consistent to the peripheral diameter of the inner tube. By adopting the technical scheme, two ends of the vacuum tube are open, and heat exchange in the tubes is smooth. The expansion joint in the corrugated crumple shape on the inner tube has a stroke, so that tube crack caused by different swelling amounts can be avoided. The expansion joint in the corrugated crumple shape is quick to machine and high in machining efficiency. The inner diameter of the expansion joint in the corrugated crumple shape is large and is of a straight-through structure, and inner tube cleaning is easy in the using process.