The invention discloses a bar code based IoT system for tracing whole-course multi-source information of fruits, and solves the problem that a present fruit tree growth management mode is out-dated in the prior art. The IoT system comprises an environment monitoring system, a control system, a signal processing and transmission system, a central processing system, an environment adjusting system and a power supply and distribution system. The IoT system is ingenious in conception, scientific and reasonable in design and easy to operate, and has prominent entity characteristics and significant progresses.