The invention discloses an agricultural safety clutch with a shear pin. The safety clutch can protect a motor. The left end of a shaft sleeve is fixed with an output shaft of the motor, a power output shaft is arranged at the right end of the shaft sleeve, the power output shaft is a stepped shaft, the small-diameter shaft section of the power output shaft stretches into the inner circle of the shaft sleeve, the excircle of the small-diameter shaft section and the inner circle of the shaft sleeve are supported through a bearing, a bearing cover is arranged at the left end of the power output shaft, the end face of the bearing cover abuts against the lateral end face of the bearing, an annular first flange is arranged at the right end of the shaft sleeve along the excircle of the shaft sleeve, and an annular second flange is arranged at the shaft shoulder of the power output shaft. A plurality of first through holes are evenly formed in the first flange in the circumferential direction, a plurality of second through holes are evenly formed in the second flange in the circumferential direction, the first through holes and the second through holes are opposite in position, a first guide sleeve and a second guide sleeve are arranged in the first through hole and the second through hole respectively, the shear pin penetrates the first guide sleeve and the second guide sleeve, and two ends of the shear ping are pressed through washers and nuts.