The invention discloses a trolley capable of automatically following a mobile terminal to walk. The trolley comprises a master control 
chip, an electronic 
compass module used for measuring 
azimuth information of the trolley, a 
bluetooth module used for transmitting 
azimuth information of the mobile terminal to the master control 
chip, an ultrasonic 
ranging sensor used for measuring distance difference between the trolley and the mobile terminal, a DC deceleration motor used for controlling the trolley to move forward or backward according to the distance difference and a steering engine used for controlling the 
steering angle of the trolley, wherein the electronic 
compass module, the 
bluetooth module, the ultrasonic 
ranging sensor, the DC deceleration motor and the steering engine are respectively connected with the master control 
chip. The 
steering angle of the trolley is calculated by the master control chip according to the difference value of the 
azimuth information of the trolley and the mobile terminal, and the calculation result is outputted to the 
driving circuit of the steering engine. Speed of the trolley is controlled by the DC deceleration motor after ultrasonic 
ranging, the azimuth information difference between the trolley and the mobile terminal is calculated after the electronic 
compass module acquires the azimuth information and finally the 
steering angle of the trolley is controlled by the steering engine so that the trolley has advantages of being high in real-time performance, easy to realize and low in cost.