The invention discloses a combined magnetic collector for electromagnetic pulsation welding. The combined magnetic collector comprises a coil, a power supply and a magnetic collector body, wherein thecoil is wound around the outer side of the magnetic collector body, and the coil is connected with the power supply through wires. When tubular workpieces are welded, the magnetic collector body comprises a first component, wherein the outside of the first component is a cylinder, and a central groove is formed in the axial direction of the first component; the cross section of the first component is a U shape, and the coil is uniformly distributed on the outer surface of the first component; and when plate-shaped workpieces are welded, the magnetic collector body further comprises a second component, wherein the second component is of a convex structure matched with a central groove of the first component in use and is provided a T-shaped cross section, and the top end of the convex partof the second component is further provided with a conducting device, so that the first component and the second component are fixed. According to the combined magnetic collector, the method of combining the first component and the second component is adopted, when two workpieces in different shapes are welded, different special magnetic collectors do not need to be replaced, and welding of the tubular workpieces and the plate-shaped workpieces can be realized only by using the first component alone or by combining the first component and the second component.