The invention discloses a triangle-triangle three-phase induction heat reactor, which belongs to the technical field of chemical industry, food and environment. The triangle-triangle three-phase induction heat reactor comprises a three-column magnetic circuit, an excitation coil, magnetic coupling tubes and heating tubes, wherein the excitation coil is wound on the three-column magnetic circuit formed by a magnetic conductive material; three magnetic coupling tubes form a group, and each group of magnetic coupling tubes is wound on each iron core column of the three-column magnetic circuit; three heating tubes form a group, and a group of magnetic coupling tubes is connected with a group of heating tubes; a sample inlet and a sample outlet are arranged right in the middle of the magnetic coupling tube or the heating tube; each group of magnetic coupling tubes and each group of heating tubes present three-phase triangle connection; and connection between the magnetic coupling tube groups and the heating tube groups present a triangle-triangle structure of a three-phase circuit. The triangle-triangle three-phase induction heat reactor is provided with three sample inlets and three sample outlets, and while liquid samples are quickly heated, simultaneous feeding and online collection of three different samples can be realized, and the liquid samples are not polluted.