The invention relates to a capacitive power estimation method for a large transformer field partial discharge test. The capacitive power estimation method is technically characterized by comprising the following steps that the capacitive power of windings to the ground and the capacitive power between the windings are estimated by adopting an integrated power method; the capacitive power of the windings is estimated by adopting the integrated power method; the estimated capacitive power of the windings to the ground, the estimated capacitive power between the windings and the estimated capacitive power of the windings are added, and then the total capacitive power is obtained. The capacitive power estimation method is reasonable in design, the capacitive power of the large transformer field partial discharge test is estimated through the integrated power method, by deeply analyzing the transmission path of the capacitive power in a transformer for transmission and reasonably selecting the capacitive power, the estimation precision is improved, the capacitive power estimation method has good engineering practicability and can be used for transformers of different structure modes and voltage levels.