The invention relates to a high-precision isolated krypton lamp high-voltage power circuit with a function of current adjustment, and the circuit comprises an auxiliary power supply circuit and a control and drive circuit, and also comprises a lamp current isolation linear conversion circuit and an isolation high-voltage output and voltage and current feedback circuit. The isolation high-voltage output and voltage and current feedback circuit is connected with the auxiliary power supply circuit, the control and drive circuit and the lamp current isolation linear conversion circuit. The auxiliary power supply circuit is connected with the control and drive circuit and the lamp current isolation linear conversion circuit. The beneficial effects are that the striking and maintaining voltages are integrated into one body; the striking and maintaining voltages are switched automatically when a lamp is turned on; the circuit provided by the invention has a function of lamp current isolated linear setting and adjusting, and is good in isolated adjustment linearity; the circuit is high in performance of lamp current feedback control is high in current stabilizing precision, and is good in long-term working stability; the circuit achieves the isolated suspension high-voltage output, reduces the impact on an input end from various types of noise and disturbance of an output end, and brings convenience to a user for controlling and using a power supply.