The utility model relates to an expansion pipe launching cavity extrusion rack for casing patching. The expansion pipe launching cavity extrusion rack comprises a hydraulic pump, a hydraulic piston, an expansion cone, an expansion pipe extrusion frame, an expansion pipe upper fixing mechanism, an expansion pipe lower fixing mechanism and an expansion pipe limiting device. The expansion pipe extrusion frame comprises four main frames and a plurality of auxiliary frames, and a cuboid structure with a square cross section is formed. The expansion pipe upper fixing mechanism comprises an upper fixing column and an upper fixing plate arranged at the tail end of the upper fixing column, and the upper fixing column is vertically arranged on an auxiliary frame at the top of the expansion pipe extrusion frame; the expansion pipe lower fixing mechanism comprises a lower fixing column, a sliding rail, a lower fixing plate and a pulley, wherein the lower fixing plate and the pulley are arranged atthe top end and the tail end of the lower fixing column respectively. The lower fixing column slides on the sliding rail through the pulley and can move freely in the length direction of the expansion pipe extrusion frame. One end of the expansion pipe is limited by the expansion pipe limiting device, and the other end of the expansion pipe is extruded by the expansion cone. According to the utility model, the expansion pipe launching cavities can be efficiently, safely and stably manufactured in batches.