The utility model relates to a pump valve positioning sleeve for a polymer-injecting pump. The pump valve positioning sleeve comprises a body (1) and a guide sleeve (3). The pump valve positioning sleeve is characterized in that the pump valve positioning sleeve for the polymer-injecting pump is of a piston-shaped structure; the upper part of the pump valve positioning sleeve is provided with two seal grooves (2); the middle upper part of the body (1) is provided with two symmetrical rectangular flow guide holes (B); the cylindrical guide sleeve (3) is arranged at the center of the body (1); the height of the guide sleeve (3) exceeds that of the flow guide holes (B); and two pressure release holes (A) are symmetrically arranged at the upper part of the guide sleeve (3). The pump valve positioning sleeve has the advantages of simple structure, reasonable design and low liquid flow resistance; the eccentric wear of a valve ball and a valve seat is avoided; due to the pressure release holes, a spring and a valve more smoothly reciprocate; the damage to accessories at the fluid end is reduced; the polymer-injecting quality is improved; and the labor intensity of post workers is reduced.