Device and method for trimming absolute value of floating high-voltage resistor

The invention relates to the technical field of integrated resistor absolute value trimming, and particularly discloses a floating high-voltage resistor absolute value trimming device and a floating high-voltage resistor absolute value trimming method. Each trimming branch comprises a low-voltage trimming switch, a metal fuse and a trimming resistor which are electrically connected in sequence, and each trimming branch is connected with the main resistor in parallel; the on-off state of the low-voltage trimming switch of each trimming branch is controlled by a register; a resistor formed by connecting the main resistor and each trimming branch in parallel is used as an absolute resistor; the absolute value trimming of the absolute resistance is controlled by fusing or not fusing the metal fuse of each trimming branch; the fusing mode of the metal fuse of each trimming branch is laser fusing. The low-voltage trimming switch can work under high voltage, the chip area is reduced, meanwhile, register trimming and