The invention provides a weight sorting device for electronic commerce. The weight sorting device for the electronic commerce comprises a support, a conveying mechanism arranged on the support and comprising an upper piece end and a lower piece end, an unloading plate, and a sorting balance, wherein one end of the unloading plate is hinged to the support, and is arranged above the upper piece end of the conveying mechanism, and the other end of the unloading plate is hinged to a telescopic mechanism; the sorting balance is arranged below the lower piece end of the conveying mechanism, and comprises a scale, a supporting rod, a weight sensor and a swinging control mechanism; the supporting rod is arranged on the support; the scale is hinged to the supporting rod; the weight sensor is arranged on the scale; one end of the swinging control mechanism is hinged to the scale; and the other end of the swinging control mechanism is arranged on the support. The weight sorting device can automatically unload goods on a goods van and performs classification according to weight.