Abstract: The present invention relates to a wireless multi-modal tonoarteriogram (TAG) monitoring apparatus and system based on nail sensing. The invention relates to the field of blood pressure monitoring technology. The nail sensing based, wireless multi-modal tonoarteriogram monitoring apparatus comprises a nail patch, a plurality of sensors and a processing module, at least one first sensor of the plurality of sensors is arranged on the nail patch, the plurality of sensors are used for obtaining a biological signal at a fingernail; the processing module is used for obtaining a target physiological parameter according to the biological signal at fingernail, with the target physiological parameter comprising a central tonoarteriogram signal.