The invention discloses a magnetic-gravity combined separation process for magnetite, which is characterized by comprising the following steps of: introducing raw ore for primary grinding, performing primary spiral classification work, introducing settled sand of a coarse-fine cyclone into a roughing spiral chute and a cleaning spiral chute; performing scavenging and magnetic separation, and tailings discarding on tailings of the roughing spiral chute, and introducing the concentrate of the cleaning spiral chute into a fine sieve; introducing overflow of the coarse-fine cyclone into a primarydehydration tank, introducing underflow of the primary dehydration tank into a magnetic separator, wherein the overflow of the primary dehydration tank is tailings; introducing the concentrate of themagnetic separator into the fine sieve, introducing the tailings of the cleaning spiral chute, the concentrate of a scavenging magnetic separator and oversize products of the fine sieve into a regrinding machine, and returning the reground products to the coarse-fine cyclone for classification; and introducing undersize products of the fine sieve into a secondary dehydration tank, wherein the underflow of the secondary dehydration tank is the concentrate, and the overflow of the secondary dehydration tank is the tailings. The process flow is more reasonable and the separation cost is effectively reduced.