The invention discloses a pump mixing type pipeline dosing device for comprehensive utilization of gold cyaniding tailings, and relates to the technical field of mining processing equipment. The device comprises a bottom plate, a plurality of supporting plates, a barrel and a hood, one end of the barrel is fixedly connected with one end of the hood, and the supporting plates are fixedly connectedwith the barrel and the peripheral side face of the hood. By using a medicine adding box, a piston, a medicine cavity and a plug, in the reciprocating sliding process of the piston, a pressure cavitycan suck medicine liquid through a medicine inlet pipe, then when the piston moves leftwards, the plug can be separated from the pressure cavity, then the medicine liquid can enter the barrel, and thestructure can intermittently add medicine to a mixture in the barrel, so that the medicine liquid and raw materials are mixed more sufficiently; when the plug reciprocates, the communicating positionof the barrel and the pressure cavity can be prevented from being blocked; by using an air cavity and an aeration pipe, when the piston slides back and forth, the air cavity continuously compresses air and wind power to enter the aeration pipe, and then aeration is performed through a first one-way valve, so that the reaction of liquid medicine and raw materials is facilitated.