The invention relates to a self-setting method for an intelligent valve positioiner and concretely relates to a one-key self-setting method based on a nozzle flapper technology. With one-key setting, all setting work can be finished; one-key setting comprises performer type setting, performer direction setting, stroke range setting, maximum speed setting, intermediate speed setting, minimum speed setting and PID parameter setting. The one-key self-setting method based on the nozzle flapper technology is advantageous in that accurate control can be achieved via PID control; control time is short and around 2 to 5 seconds; high precision can be achieved and can reach 0.1% to 0.3%; the method systemically and comprehensively solves technical difficulties of excessive long time for self-setting of a traditional intelligent positioner and repeated self-setting; by the use of the method, the positioner can be set once for all, and demands of complicate on-site work conditions can be met; and short time and high accuracy can be realized.