A composite heat adjusting device, comprising: a plurality of heat plates , each of the plurality of heat plates including a substrate and a heating unit , the substrate including a body and an installation element disposed on any side of the body , the heating unit including a circuit board disposed in the installation element and including at least one heating element disposed on the body and electrically connected to the circuit board ; and a plurality of electrical connection members , each of the electrical connection members including a connection base and a plurality of connection portions disposed on the connection base , the connection portions being electrically connected through the connection base , wherein the installation element of each heat plate is extended to form an installation recess at any corner of the heat plate , each circuit board includes a plurality of connection terminals extended to the installation recess , and the connection terminal is connected to the corresponding connection portion of the electrical connection member , so that the heat plates are electrically connected to each other, characterized in that a plurality of terminal holes for insertion of the connection terminals in a direction perpendicular to the heat plate are disposed on the connection portion of the electrical connection member , the composite heat adjusting device includes multiple electrical connection members , a recessed connection hole and a protruding connection pin are disposed on the connection base of each electrical connection member , and the electrical connection members are correspondingly coupled to insert the respective connection pins in the respective corresponding connection holes . a plurality of heat plates , each of the plurality of heat plates including a substrate and a heating unit , the substrate including a body and an installation element disposed on any side of the body , the heating unit including a circuit board disposed in the installation element and including at least one heating element disposed on the body and electrically connected to the circuit board ; and a plurality of electrical connection members , each of the electrical connection members including a connection base and a plurality of connection portions disposed on the connection base , the connection portions being electrically connected through the connection base , wherein the installation element of each heat plate is extended to form an installation recess at any corner of the heat plate , each circuit board includes a plurality of connection terminals extended to the installation recess , and the connection terminal is connected to the corresponding connection portion of the electrical connection member , so that the heat plates are electrically connected to each other, characterized in that a plurality of terminal holes for insertion of the connection terminals in a direction perpendicular to the heat plate are disposed on the connection portion of the electrical connection member , the composite heat adjusting device includes multiple electrical connection members , a recessed connection hole and a protruding connection pin are disposed on the connection base of each electrical connection member , and the electrical connection members are correspondingly coupled to insert the respective connection pins in the respective corresponding connection holes . <EOS>