The invention discloses an anti-blocking device for a seed-metering fertilizer pipe and a slippage type groove opener employing the device. The anti-blocking device comprises a movable lug used for blocking a pipe orifice of the seed-metering fertilizer pipe, wherein a fixing rack is arranged outside the seed-metering fertilizer pipe; the bottom end of the fixing rack is provided with a fixing rack lug; a movable lug lifting lug is arranged on the movable lug; the fixing rack lug is connected with the movable lug lifting lug through a fixed pin shaft; a torsion spring is sleeved outside the fixed pin shaft; and one end of the torsion spring acts on the fixing rack, and the other end of the torsion spring acts on the movable lug. According to the device, the blockage phenomenon can be avoided, and due to the movable lug with the torsion spring device, the earthing property can be improved, the working efficiency is improved, the operation is convenient, and the working quality is guaranteed.