The invention provides a transformer winding deformation on-line monitoring chip. According to the principle of the transformer winding deformation on-line monitoring chip, transformer winding deformation is monitored in an on-line frequency response method. The chip comprises a frequency sweeping signal generator module, a data collection module, a data processing module, a control module, a data storage module and a communication module; the frequency sweeping signal generator module, the data collection module, the data processing module, the data storage module and the communication module are respectively connected with the control module, and the frequency sweeping signal generator module, the data collection module, the data processing module and the data storage module are sequentially connected in a single way. The transformer winding deformation on-line monitoring chip has the advantages of being miniaturized, low in cost, low in power consumption, strong in anti-jamming capability and the like, is an essential method of achieving on-line monitoring, provides core guarantee for safe and reliable operation of a power grid, and is used for a transformer winding deformation monitoring system.