The invention discloses a method and device for monitoring grain condition in a bulk grain container, and the method comprises the steps: collecting temperature and
humidity data, obtaining the temperature and
humidity data of the environment where grains are located in real time, transmitting the temperature and
humidity data to a collection terminal, marking a time
label on the received temperature and humidity data by the collection terminal to generate timing temperature and humidity data; transmitting the timing temperature and humidity data to a remote
server; performing temperature and humidity
data processing: enabling the remote
server to perform filtering and
wavelet analysis on the timing temperature and humidity data, interpolate and eliminate repeated data, and obtain continuous temperature and humidity data of each acquisition node; and performing temperature and humidity data fusion: fusing the continuous temperature and humidity data by using a k-medoids clustering
algorithm, carrying out fusion once in each acquisition period, fusing the continuous temperature and humidity data of the plurality of acquisition nodes into a piece of continuous overall temperature and humidity data, and reflecting the overall
state of the environment in which the grains are located by the overall temperature and humidity data. The invention further discloses a monitoring device applying the monitoring method.