The invention is a portable nutrition inquiry, calculation and evaluation device, including a microprocessor and the operation panel linked to microprocessor, small LCD screen, the audio output device for voice information output, and the communication device for exchange of information with personal computers and the specific websites of the Internet further. Microprocessor has a variety of modules for nutrition inquiries, the individual body measuring and calculating, weight regulation, nutrition calculation and evaluation. The invention also provides the nutrition inquiry, calculation and evaluation methods of the device. The useful technical effect of the invention is: easy to carry, readily available, no external power and other equipments need, timely internal food composition database expansion and nutrition module function updating, but also integration with electronic dictionaries, mobile phones and other devices. Users can understand their nutritional status of the body, and promptly adjust diet and exercise mode, more effectively protect their health.