The invention belongs to the technical field of drip irrigation equipment purifying devices and particularly relates to a filtering and purifying system for drip irrigation equipment. The filtering and purifying system comprises an anti-scale stacked filter, a cyclone dust collector, a water inlet pipe, a telescopic water inlet, a four-way valve, a blow-off pipe, a circulating pump, a circulating pump valve and a main water outlet pipe, wherein the telescopic water inlet is arranged at an inlet of the cyclone dust collector, and an outer pipe is connected with the main water inlet pipe; various ends of the four-way valve are connected with a water outlet of the cyclone dust collector, a water inlet of the anti-scale stacked filter, the circulating pump and the blow-off pipe separately; and a water outlet end of the circulating pump passes through the circulating pump valve to be connected with an inner pipe of the telescopic water inlet. Through the circulating pump device, the series stacked filter and cyclone dust collector can be at the optimum operating velocity, the equipment purifying efficiency is improved; and a cultivation structure and after-treatment structures of inactivation and ion exchange resin are arranged for the stacked filter device, so that low-cost water softening is achieved and the soil salinization possibility is reduced.