The utility model discloses a seedling growing rack monitoring system comprising a controller, a monitoring host, a camera head, a video server, a heater, a humidifier, a micro water pump connected with the humidifier, a motor driver used for driving the micro water pump to work, a drive circuit used for driving the heater to work, a humiture sensor used for detecting the humiture of the seedling growing rack, a 3G router used for wirelessly transferring the signals collected by the humiture sensor to the monitoring host and a smart phone, and a keyboard, a display, a RJ-45 interface, a 3G wireless module and a USB interface respectively connected with the monitoring host. The seedling growing rack monitoring system can well keep the temperature and humidity in the seedling growing rack at a set value in a long time, thus improving accelerating germination seedling growing efficiency and survival rate, effectively solving the problems that an existing monitoring system cannot conveniently control environmental parameters in the seedling growing process, is poor in chronergy, easy to be affected, and low in accuracy.