The invention discloses a method for accelerating nano bainite phase transformation. The method is characterized in that a target steel material is firstly austenitized, and nano bainite phase transformation is accelerated by controlling a key node of an equal-temperature phase transformation process of a first stage and a key equal-temperature phase transformation temperature of a second stage; the key node of the first stage is instant maximum-rate time node of bainite phase transformation or an average maximum-rate time node; and the phase transformation temperature of the second stage refers to that a strength value of undercooled austenite which is not transformed at the temperature is equal to strength of initial overcooled austenite. The method is simple in process, can greatly shorten phase transformation time of nano bainite, and guarantees that the obtained structure is nano bainite.