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  In this study,ferrous oxalate was prepared from ferrous sulfate and oxalic acid by precipitation reaction.The effect of the reaction conditions,such as reaction temperature,reaction time,reaction mode,laying-aside time,drying temperature and additive agent on the purity of ferrous oxalate was investigated.The optimal reaction conditions for the purity of ferrous oxalate were obtained as follow:reaction temperature of 60℃,reaction time of 55m in,reaction mode of ultrasound,laying-aside time of 30min after titrating,drying temperature of 120℃ without additive agent.Under these optimal conditions,the purity of prepared sample was 99.66%,containing PPM-grade impurities.……