The invention discloses an anti-blocking organic fertilizer screening machine, which comprises a machine body, wherein the machine body is fixed on the support frame in an inclined way; the upper surface of the machine body is provided with a cover plate with barbs; the four corners of the connecting positions of the machine body and the cover plate are provided with chutes; the cover plate and the machine body are vertically and glidingly connected through the chutes; the upper end of the cover plate is provided with a feeding opening; the middle part of an inner cavity of the machine body is provided with a screening net; springs are arranged at the four corners of the screening net; the bottom ends of the springs are fixedly connected with the four corners of the bottom end of the inner cavity of the machine body; the upper end of the screening net is connected with a vibration motor; the lower end of the screening net is provided with an impurity discharging opening; a material collecting cabin is arranged under the screening net; the upper end of the bottom plate of the material collecting cabin is provided with a telescopic rod; one end of the telescopic rod is connected with a hydraulic cylinder; the other end of the telescopic rod is connected with a push rod; the lower end of the bottom plate of the material collecting cabin is provided with a discharging opening. The anti-blocking organic fertilizer screening machine has the advantages that the work environment is good; the automation degree is high; the maintenance cost is low.