The invention discloses a testing tool for an injection molding machine spring mold. The testing tool comprises a mold closing fixed plate and a mold closing moving plate which are oppositely arranged in an injection molding machine. The testing tool is characterized in that at least two spring mold testing mechanisms are fixedly arranged on the mold closing moving plate, located between the mold closing moving plate and the mold closing fixed plate and symmetrically or circumferentially and evenly distributed on the mold closing moving plate; and each spring mold testing mechanism comprises a spring base, a spring and a fixed plate fixing base which are sequentially arranged, and the spring bases are arranged on the mold closing moving plate. According to the testing tool, the spring mold testing mechanisms are vertically and bilaterally symmetrically arranged (or circumferentially and evenly distributed) on the mold closing moving plate of the injection molding machine (the number of the spring mold testing mechanisms can be determined according to the machine size), elastic force is supplied by adopting disc-shaped springs for simulating the spring mold, and the requirements of different technology conditions are met.