The invention provides a method for preparing a superhard abrasive particle tool through ultrasonic-assisted active connection. The method comprises the following steps that A, a tool base body coated with active bonding agents and abrasive particles is fixed to an ultrasonic amplitude-change pole; B, the tool base body is subjected to braze heating and temperature rising technology operation, after the active bonding agents reach the melting temperature, first ultrasonic waves are applied to the tool base body, and chemical bonding and the wetting climbing effect of the active bonding agents and interfaces of the abrasive particles are facilitated through the ultrasonic effect; C, after the temperature rising technology is completed, the first ultrasonic waves are stopped applying, when the temperature of a connection zone is lowered to the liquid-solid converting temperature of the active bonding agents, second ultrasonic waves start to be applied to the tool base body, and heat stress releasing in the cooling process is conducted through high-frequency vibration of the second ultrasonic waves; and D, after the temperature of the connection zone is lowered to the tempering temperature of the active bonding agents, processing is stopped, and after temperature of the connection zone is further cooled to the room temperature, the abrasive particle tool is obtained.