The invention discloses a titanium alloy pickling process for vacuum brazing. According to the titanium alloy pickling process for vacuum brazing, cutting fluid attachments on fins and sealing stripsare washed through gasoline/kerosene; the gasoline/kerosene left after the former step of cleaning is washed for 20 minutes through trichloro ethylene in an ultrasonic cleaning mode; after the formerstep, oxide layers are formed on the surfaces of the fins and the sealing strips and cleaned through a cleaning solution with the ratio of hydrofluoric acid to water being 1:6; and the fins and the sealing strips are cleaned through clean water. The titanium alloy pickling process for vacuum brazing adopts a three-step cleaning mode, cutting fluid is completely washed away through the gasoline/kerosene, the attachment products generated in the former step are washed away through trichloro ethylene in the ultrasonic cleaning mode and the cleaning solution with the ratio of hydrofluoric acid towater being 1:6, and thus complete cleaning of the fins and the sealing strips can be achieved.