A charging device of an automatic cruise platform for a greenhouse comprises a power monitoring module, an information transmission module and a sensor module, which are located on a movement monitoring platform (25), and a ground pressure sensor module, a charging module, an information receiving module (20), an information collection module (21), a control module (22), an AC-DC conversion module (23), and a power control module (24), which are located on a smart charging device (33). The device can automatically return to be charged at a cruise detection interval of a movement platform when the electric quantity is lower than a threshold, thereby improving the working efficiency and automation degree of a movement monitoring platform, reducing the labor management cost, and meanwhile greatly improving the reliability and safety of a charging docking process and facility power consumption.