This machine introduces balance and lever principle, by using the weight of fixture and the set weight values of poise, measured by the shift scale, to achieve the weight differentiation among intended fruits. During the process of full automatic transmission, prompt and correct weight differentiation can be gotten for a variety of fruits with different weights, such as pears, apples, mangoes, peaches, oranges, onions and so on. The characteristic for this kind of machine doesn’t only have accurate balancing precision, high efficiency, convenient operation and wide usage fields, etc, but also help improve the quality of fruits and enhance the fruit marketing competition. This kind of machine is the first-rank equipment to pick fruits out by the weight differentiation.