PCB microstrip line impedance optimization method and device

The embodiment of the invention discloses a method and a device for optimizing impedance of a PCB (Printed Circuit Board) microstrip line. The optimization method comprises the following steps: acquiring test data of insertion loss Kebang of the PCB in an air environment and a liquid cooling environment, and first processing data of the PCB; according to the first processing data, performing fitting by taking second processing data of the PCB as a variable and taking test data in an air environment as a target to obtain first fitting data after fitting; according to the first processing data and the first fitting data, performing fitting by taking liquid cooling medium data in the liquid cooling environment as a variable and taking test data in the liquid cooling environment as a target to obtain second fitting data after fitting; and based on the first fitting data, the second fitting data and the first processing data, determining the impedance of the PCB microstrip line so as to optimize the impedance of t