The present invention relates to a method for detecting the emotional state of a pet, in which a state information collection device having a microphone, a temperature sensor, and an acceleration sensor capable of respectively detecting the sounds, temperature, and activity amount of a pet is worn on one side of the body of the pet, and then the information collected by the state information collection device is analyzed such that emotional state information of the pet can be transmitted to a portable terminal carried by an owner of the pet and the like, and the method for detecting the emotional state of a pet, according to the present invention, comprises the steps of: allowing the state information collection device for receiving state information of the pet to be worn on one side of the body of the pet； selecting and inputting the type of pet through an input unit of the state information collection device； receiving the sounds of the pet in a predetermined time unit through the microphone that is one constituent element of the state information collection device； transmitting the type information and the sound information of the pet to a pet emotion analysis server by using a wireless communication network； extracting feature information of the sound information； selecting, from a database, predetermined state information corresponding to the type information and the feature information of the pet； and transmitting the state information to a portable terminal of a pet guardian by using the wireless communication network.La présente invention concerne un procédé de détection de l'état émotionnel d'un animal de compagnie, dans lequel un dispositif de collecte d'informations d'état comportant un microphone, un capteur de température et un capteur d'accélération aptes à détecter respectivement les sons, la température et la quantité d'activité d'un animal de compagnie est porté sur un côté du corps de l'animal de compagnie, puis les informations collectées par le d
