The invention relates to the technical field of agricultural irrigation, in particular to a water, fertilizer and pesticide integrated system. The system comprises an upper computer, a PLC controller,monitoring equipment, a humidity sensor, a water tank, a pesticide tank, a fertilizer tank, a water pump, a mixing tank and an irrigation pipeline. The monitoring equipment is electrically connectedwith the upper computer through a data cable and used for monitoring growing states of crops by shooting and transmitting shot pictures or videos to the upper computer, and operating personnel of theupper computer can compare and analyze the pictures or videos uploaded to the upper computer with normal growth states of the crops. Therefore, by cooperation of the upper computer, the PLC controller, the monitoring equipment, the mixing tank and the like, water, fertilizer and pesticide integrated irrigation is realized, autonomous watering, pesticide spraying and fertilizing of the crops can berealized, high selectivity of equipment is realized, a certain intelligent function is achieved, and especially in crop monitoring and pesticide and chemical fertilizer selection, labor time is effectively saved, and arrangement cost is saved.