The invention belongs to improvement of scale scraping type oil well pump used for producing wells in oil fields, and particularly relates to an improved scale scraping type oil well pump. The improved scale scraping type oil well pump comprises a plunger type oil well pump arranged on a lower end opening of an oil pipe through an upper oil pipe union, an upper plunger arranged in a big pump cylinder of the plunger type oil well pump in a matched manner, a lower plunger arranged in a small pump cylinder in a matched manner, and a scale scraping cutter body arranged at the lower end of the lower plunger through a connection device. The scale scraping cutter body is in movable fit with the internal diameter of the small pump cylinder. Spray welding layers are arranged on the surface of the upper plunger and the surface of the lower plunger. The spray welding powder of the spray welding layer comprises chemical components, by weight percent: 0.7-1.0 of C, 3.2-4.2 of B, 3.5-4.5 of Si, 16.5-18.5 of Cr, 8 or less of Fe, 2-3.5 of Mo, 2-3.5 of Cu and the balance Ni. The improved scale scraping type oil well pump is reliable in performance, the welding layers are sprayed to the surfaces of the plungers, the material adaptation is good, the possibility that sediment scale blocks the plungers can be reduced, abrasion between the pump cylinder and the plungers is lowered, and the service life of the oil well pump is prolonged.