The invention discloses a two-stage dry mixing method for powder metallurgy iron-based mixed powder. The two-stage dry mixing method includes steps of 1), weighing iron powder, alloyed powder, graphite powder, lubricating agent and binding agent according to requirements of the iron-based mixed powder; 2), adding the weighed iron powder, alloyed powder, graphite powder, lubricating agent and binding agent to a 1# blender to be mixed for 10-20mins; 3), placing the materials in the 1# blender into a 1# transit warehouse; 4), paving the materials evenly on a steel belt and keeping the same in a high-temperature zone of a heating furnace at the temperature of from 140 DEG C to 200 DEG C for 2-10mins; 5), transferring the materials out of a cooling zone of the heating furnace and the temperature of which is dropped below melting temperature of the lubricating agent into a 2# transit warehouse; 6), further transferring into a 2# blender and adding the lubricating agent into the same; 7), starting up the 2# blender and the same to operate for 15-30mins; 8), transferring the materials into a 3# transit warehouse; 9), sieving and packaging to obtain qualified iron-based mixed powder. The two-stage dry mixing method has the advantages of reasonable design, environmental friendliness, high production efficiency, capability of mass production, and the like.