A method for monitoring a plant health state relates to the technical field of intelligent agriculture. The method is used for intelligently determining the plant health state and timely prompting farmland managers to perform control for at least one plant in a poor plant health state. The method for monitoring the plant health state includes: performing first determination according to plant health state information; when a determination result is that there is a risk of poor plant health, performing second determination according to second plant health state information in an orientation where at least one plant at risk of poor plant health is located, so as to accurately obtain plant health state information, such that farmland managers can learn the current situation of the plant in a field timely and perform control timely. An apparatus applying the method for monitoring the plant health state is provided. The apparatus is used for monitoring the plant health state.