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In order to solve the problems of low intelligence and inability to monitor the operation of the machine in the process of carrot combine harvest in China, an intelligent monitor system which can be mounted on the carrot combine harvest machine was developed. The intelligent monitor system mainly included the carrot combine harvest adaptive speed regulation module, the carrot jam monitor module, the carrot fruit counting module, the man-machine interaction module and the position information module. The monitor system was mainly controlled by STM32F103 single chip microcomputer, information was transmitted by CAN bus, and a variety of sensor fusion technologies were applied to realize information collection and regulation of carrot joint harvest operation. Carrot harvest adaptive tape speed regulating module based on the fuzzy PID control algorithm collected machine operating speed, clamping angle conveyor belt speed and gripping delivery mechanism through the sensors, by using pulse width modulation control solenoid valve opening clamping conveyor belt speed adjustment to realize the carrot harvest machines adaptive adjusting job status. The experimental results showed that the model had good robustness and low overshoot. Field experiments showed that the monitor accuracy of each module was not less than 96%, the error value of the adaptive belt speed regulation module was not more than 0.1m/s, the belt speed response time was no more than 0.8s, and the adjustment time was no more than 1.6s. The intelligent monitor system can meet the requirements of field operation and realize the real-time monitor of carrot combine harvest and automatic control of clamping conveyor belt speed, which was beneficial to the development of carrot intelligent combine harvest.