The invention discloses a T-shaped boiler with a reheater. According to the invention, the heating surface of the boiler comprises an overheater, the reheater and a coal economizer. In the T-shaped boiler, a column body uplink hearth and horizontal flues in symmetrical or asymmetrical arrangement at the left side and the right side constitute a T-shaped structure; the horizontal flues are respectively connected with a downlink convection flue again; from a view of the flow direction of the flues, flue gas flows out of a left exit or a right exit of a hearth, and sequentially flows through a low-temperature overheater, a high-temperature overheater, an re-heated high-temperature reheater, a re-heated low-temperature reheater and the coal economizer; and the left side and the right side of the T-shaped boiler are both provided with furnace arches.