The invention provides a cold chain monitor, a cold chain monitoring system and a control method of the cold chain monitoring system. The cold chain monitor comprises a master control module, a positioning module, an induction sensing module, a communication module, a door magnetism detection module, a voltage monitoring module, a data storage module, a clock module, a display module, a button module and a power supply module. The cold chain monitoring system comprises the cold chain monitor, a data collection device and a cold chain monitoring software platform. The control method of the cold chain monitoring system comprises the steps of initialization, data collection, data transmission, platform data display, scheduling processing and data analysis. By means of the cold chain monitor, the cold chain monitoring system and the control method of the cold chain monitoring system, the chain breaking problem in cold-chain logistics is solved, and the problems of temperature collection monitoring, data transmission, back-stage management and early-warning processing in the cold chain transportation process are especially solved.