The utility model discloses a high A corrosive environment instrument repacking hall button, it includes: button shell, magnetism button, STM32F103 microprocessor, DC DC converter, hall sensor, instrument amplifier and opto -coupler level shifting circuit. The principle of this button changes the electric contact by repacking instrument button into hall sensing mode, is applied to high A corrosive environment instrument button upgrading repacking. To be cut off by the circuit of repacking instrument button, insert this button, can show the life who prolongs high A corrosive environment instrument button.