The invention discloses a powder metallurgical gear. The powder metallurgical gear is prepared from water atomization iron powder, copper powder, molybdenum powder, vanadium powder, nickel powder, yttrium powder, aluminum powder, magnesium powder, cobalt powder, lead powder, steel slag powder, iron-melted furnace slag powder, ferroalloy slag powder, modified tree ash powder, graphite powder, amino resin, polyether modified silicone, hydroxypropyl methyl cellulose, zinc stearate, polyethylene glycol, ethylene bisstearamide, stearic acid, carbon fibers, glass fibers, boron nitride, epoxypropoxy propyl trimethoxysilane, silicon dioxide, manganese sulfide, acrylate, an inhibitor, a binder, an enhancer, a cutting agent, a lubricant, a coupling agent and a dispersing agent. According to the powder metallurgical gear, by means of specific composition proportion, the overall density is uniform, the compactness is high, the elongation and reduction of cross section are high, the abrasion resistance, strength and hardness are good, the material utilization rate is high, and the materials are suitable for rapidly producing high-performance gears on large scale.