The invention relates to a single-oil-tank dual-body parallel reactor and belongs to the technical field of transformers. The technical scheme is that: two reactors with independent bodies are arranged in an oil tank and are connected in series; a head end of a reactor Xb2 winding and a tail end H2 of a reactor Xb1 winding are connected in series and are led out through an H2 outgoing line and an H2 outlet sleeve collinearly; a tail end Hx of the reactor Xb2 winding is led out through an Hx outgoing line and an Hx outlet sleeve; and a head end H1 of the reactor Xb1 winding is led out through an H1 outgoing line and an H1 outlet sleeve. The invention has the advantages that: by the parallel reactor, the number of the reactors can be reduced, the structure can be simplified, the number of sleeves is reduced, and the cost is reduced. Meanwhile, wiring connection of a power system is probably simplified, and occupied space is saved.