The invention discloses a circulation type reaction feed liquid heating device which comprises a support. A connecting plate which is horizontally arranged is arranged on the top of the support. The circulation type reaction feed liquid heating device is characterized in that a groove is formed in the connecting plate, and a groove body in a cylinder shape is arranged in the groove; a heat capacity layer is arranged on the outer side face of the groove body, an oil inlet is formed in the upper portion of one side face of the heat capacity layer, and an oil outlet is formed in the lower portion of one side face of the heat capacity layer; multiple partition plates are horizontally arranged in the heat capacity layer, and the heat capacity layer is divided into multiple heat capacity cavities through the partition plates; the singular layers of the partition plates are provided with through holes in the right end of the groove body, and the even layers of the partition plates are provided with through holes in the right end of the groove body; the oil inlet communicates with the left side face of the top heat capacity cavity, and the oil outlet communicates with the right side face of the bottom heat capacity cavity; and the heat capacity layer is connected with a heat oil conduction mechanism. The circulation type reaction feed liquid heating device has the beneficial effects that design is reasonable, heating is comprehensive and uniform, energy is saved, reaction feed liquid is thoroughly dumped conveniently, and cleaning is convenient.