The invention discloses an anti-pollution oil drainage oil-well pump for an electroplating nickel-tungsten-phosphorus alloy. The anti-pollution oil drainage oil-well pump for the electroplating nickel-tungsten-phosphorus alloy comprises a pump cylinder assembly, a traveling valve plunger assembly, a fixed valve assembly and a communicated oil drainage device. The pump cylinder assembly comprises apump cylinder, an upper pump cylinder connecting hoop and a lower pump cylinder connecting hoop; the upper pump cylinder connecting hoop and the lower pump cylinder connecting hoop are connected withtwo ends of the pump cylinder; an oil drainage hole is formed in the lower pump cylinder connecting hoop; the communicated oil drainage device comprises a communicated ejector rod arranged on a fixedvalve cover; the length of the communicated ejector rod is larger than the axial distance between two ends of a lower traveling cover; the matching relation is as follow: when a lower traveling valveball downwards presses the communicated ejector rod, the communicated ejector rod opens the lower traveling valve ball, an ejector shaft at the upper end of the lower traveling valve ball opens a middle flowing valve ball, a plunger inner hole is communicated, and the fixed valve cover moves downwards to open the oil drainage hole to drain oil; an amorphous-state nickel-tungsten-phosphorus anti-corrosion anti-wear protection layer is electroplated on the inner surface of the pump cylinder; and the thickness of the protection layer is not lower than 75mum. The anti-pollution oil drainage oil-well pump for the electroplating nickel-tungsten-phosphorus alloy provided by the invention can effectively prevent oil and water from overflowing, can communicate the plunger inner hole so as to realize fast oil drainage, and is environmental-friendly and reliable; and meanwhile, an amorphous-state nickel-tungsten-phosphorus alloy electroplating liquid coating is adopted on the protection layer onthe inner surface of the pump cylinder, so that through adjusting the composition proportion of electroplating liquid, the neutral salt mist resistance, the acid and alkali corrosion resistance, thesulfide resistance and the wear resistance of the protection layer are improved.