The invention relates to a heavy metal sludge precalcination-solidification treatment method, belonging to the technical fields of resource comprehensive utilization and environmental protection. The method comprises the following steps: carrying out natural air drying on heavy metal sludge, crushing to the particle size of 10mm or below, and drying at 160-250 DEG C for 4-15 hours to obtain a dry material; carrying out precalcination on the dry material at 800-1000 DEG C for 1-3 hours to obtain a calcined product, wherein flue gas is generated in the precalcination process, and is subjected to cloth bag dust collection and discharged after reaching the standard; adding cement and lime into the calcined product, and thoroughly mixing to obtain a mixture, wherein every 100 parts of the mixture is composed of 40-90 parts of calcined product, 5-50 parts of cement and 5-15 parts of lime; and adding water, stirring to obtain a solidification product, carrying out cast forming on the solidification product, naturally curing in the room for 28 days, and sending into a storage yard for safe stacking. The heavy metal sludge is subjected to precalcination to lower the arsenic content, so that the cement consumption in the subsequent solidification process is reduced, thereby lowering the cost.