The invention discloses an injection distribution thermoelectric decoupling way based on axial thrust balance and reheat balance, and belongs to the technical field of heat and power cogeneration andcentral heating. In order to solve the problem that the power generation load needs to be increased when a large amount of heat needs to be supplied due to the current thermoelectric connection of a thermal power plant, a decoupling ejector device is arranged, wherein a high-pressure driving steam inlet of a gas distribution ejector is connected with a new steam pipe, a low-pressure steam inlet isconnected with a high-pressure cylinder exhaust steam reheater cooling section pipe, a medium-pressure steam outlet is connected with an inlet of a boiler reheater, an outlet reheater heating sectionpipe of the boiler reheater is provided with a steam extraction port for extracting required high-pressure steam, the reheater cooling section pipe is not provided with a steam external supply extraction opening, and all high-pressure exhaust steam is sent into the ejector for compression and then sent out. A system control method comprises the following steps that the steam external supply extraction amount of the reheater heating section pipe is equal to the sum of the driving steam amount of the gas distribution ejector and the thermoreduction water amount; the steam inlet amount of a high-pressure cylinder and the steam inlet amount of a low-pressure cylinder are changed in a nearly equal proportion; according to a safety decoupling model and a decision-making and demand curve of thesafety decoupling model, the optimal injection ratio of the ejector is adjusted, and the stepless adjustment complete thermoelectric decoupling is realized.