The present invention relates to an automatic spray system for an agricultural plastic greenhouse including an information processing device, capable of spraying water and a chemical solution in a short time and an automatic spray method and an information processing device thereof. According to one embodiment of the present invention, the system comprises: one or more sprayers automatically receiving a chemical solution for crops by operation of a first pump in an agricultural plastic greenhouse and water by operation of a second pump to spray the chemical solution for crops and the water and the information processing device installed and operated by being spaced apart from the sprayer at a predetermined distance. The information processing device: automatically starts operation of all of the first pumps individually linked with the at least one or more sprayers when a user setting command for an insect control mode is received automatically stops the operation of all of the first pumps to remotely, integrally, and automatically control a chemical solution spray operation of each sprayer when the corresponding insect control mode passes automatically starts operation of all of the individual second pumps linked with the sprayers when a user setting command for a temperature falling mode is received automatically stops the operation of all the second pumps when the corresponding temperature falling mode passes automatically starts the operation of all the second pumps linked with the sprayers when a user setting command for a humidification mode is received and automatically stops all the second pumps to remotely, integrally, and automatically control a water spray operation of each sprayer so as to totally, remotely, integrally, and automatically control the operation of the sprayers disposed in various positions when the corresponding humidification mode passes.COPYRIGHT KIPO 2018실시예는 농업하우스 내의 제1 펌프 구동에 의한 작물 약액과, 상기 제2 펌프 구동에 의한 물을 자동 공급받아 분무하는 적어도 하나 이상의 분무기 및,
