Transformer for teaching

The present invention discloses a transformer for teaching comprising a fuel tank, a teaching device body, a teaching coil and an oil conservator, wherein the walls of the fuel tank and the oil conservator are all provided with transparent observation windows and transverse cross sections of a high, a middle and a low voltage coil in the fuel tank, wherein the transverse cross sections correspond to the transparent observation windows; and an end face of the oil conservator is provided with a round toughened glass observation window used for observing the internal structure of the oil conservator. The transformer for teaching has the advantages of wide range of observation, good visibility, beautiful exterior and high mechanical strength, and can satisfy the requirement of being rainproof, moistureproof and antirust.