The invention discloses a device and a method for intelligently metering and monitoring a blending process for a mixing plant, belonging to the technical field of the transportation and construction industries. The device comprises at least two storage bins, a weighing sensor, a monitoring instrument, a PLC (Programmable Logic Controller), a GPRS (General Packet Radio Service) and a terminal computer, wherein a discharging door of each storage bin is connected with the monitoring instrument by a signal wire; the weighing sensor is arranged below the storage bin; the weighing sensor is connected with the monitoring instrument by two signal wires; the monitoring instrument is connected with the PLC by an RS 485 bus, wherein the monitoring instrument internally comprises a setting unit, a signal receiving unit, a signal converting unit, a data computing unit and a data display unit; and the PLC is connected with the terminal computer by the GPRS. According to the invention, a monitoring staff can acquire the relevant data even without arriving at the scene, and actual unloading amount of the material can be timely checked, so that the working staff can effectively monitor in real time, and much manpower and many material resources can be saved.