The invention provides a transformer analog device, and belongs to the field of transformer capacity detection devices. The transformer analog device comprises a casing, wherein a transformer primary side three-phase interface, a secondary side three-phase interface, a secondary side neutral point interface and a relay interface are formed in the casing; a primary side analog circuit, a secondary side analog circuit and a control circuit are arranged in the casing; the primary side three-phase interface, the secondary side three-phase interface and the relay interface are connected to power source ends of the primary side analog circuit, the secondary side analog circuit and the control circuit respectively. The actual operation cost is reduced, and the measurement is very convenient.