The invention discloses a transformer device state maintaining guiding method based on TRIZ. The method comprises the following steps: establishing a transformer device state maintaining guiding model: setting a TRIZ inventive principle matrix, collecting the experience value sequences of parameters of various quantities of state in state maintaining of a transformer device to be guided in a TRIZ inventive principle domain, getting the discrete mapping sequence values reconstructed by the quantities of state, and getting complete correlation coefficients between the quantities of state and the TRIZ and constructing a transformer device guiding model; using the transformer device guiding model to guide the transformer device: collecting actual sequences of parameters of various quantities of state in state maintaining of the transformer device to be guided in the TRIZ inventive principle domain, getting the actual discrete mapping sequence values reconstructed by the quantities of state, getting the complete correlation coefficients between the quantities of state and the TRIZ inventive principle and getting the guided result of the transformer device. According to the invention, the accuracy of periodically evaluated results of the working states of a No.1 transformer device and a No.2 transformer device of a main transformer for a 220 KV station of a power grid is improved.