The invention belongs to the technical field of dehumidification devices, and particularly relates to a transformer oil conservator dehumidification device based on image humidity recognition and a dehumidification method thereof. The dehumidification device comprises an electromagnetic valve, a drying agent tank, a heater, a camera, a dehumidification control device and a data acquisition device,wherein the electromagnetic valve is connected between the drying agent tank and a pipeline of the transformer oil conservator, the heater is arranged in the drying agent tank, and the camera is arranged outside the drying agent tank. The heater and the control end of the electromagnetic valve are respectively connected with an output control port of the dehumidification control device; the output end of the camera is connected with the input port of the dehumidification control device; the dehumidification control device comprises a heater driving circuit, an electromagnetic valve driving circuit, an address module, a microprocessor module, a display module, a key module, a storage module, a communication module, a power supply module and a temperature sensor. The effect of replacing a drying agent manually is achieved, the degradation speed of the insulating oil is reduced, the labor intensity is reduced, and the working efficiency is improved.