The invention relates to the technical field of welding equipment, and discloses a fixing device for turning, electric riveting and welding. The device comprises an operation and control platform, wherein a fixing plate is fixedly mounted on the side surface of the upper surface of the operation and control platform; a telescoping rod movably sleeves the telescoping fixing plate, and two ends of the telescoping rod extend to the outer parts of two sides of the fixing plate; a limiting block is fixedly mounted at one end, positioned at the outside of the fixing plate, of the telescoping rod. According to the fixing device for the turning, electric riveting and welding, the fixing plate arranged on the operation and control platform is used as a supporting point; a transmission plate is driven through the telescoping rod and a telescoping spring to move toward a fixing platform direction; the transmission rod and a nut are fixed, so that the side surface of a welding assembly can be effectively fixed through a positioning plate and the transmission plate; the nut is sleeved with a fixing groove; the welding assembly is downwards pressed through one end of a pressing plate, and the other end of the pressing plate is supported through a steel block, and thus the welding assembly can be effectively fixed in the longitudinal direction, and as a result, that a connecting point is offset during welding influences the welding effect can be avoided.