The invention relates to the field of LED lamps and discloses a closed-loop LED plant lamp which comprises an LED lamp holder, a chassis on which a plant is planted, a bracket, a monitor used for monitoring the growth condition of the plant, a controller, a control terminal and a giver used for regulating the growth environment and factors of the plant; the monitor transfers the monitored plant growth condition to the controller; the controller transfers the plant growth condition to the control terminal; the control terminal automatically or manually controls output of the giver through the controller; the LED lamp holder and the chassis are connected with each other through the bracket; the chassis supports the LED lamp holder through the bracket; the LED lamp holder provides a light source required by the plant; and the monitor, the controller, the control terminal and the giver are utilized to perform real-time monitoring on growth of the plant, so that normal growth of the plant is ensured, and a person can personally feel happiness of personally culturing the plant to enable plant growth to be company of person life.