Using two-level approximation with the Bloch-Redfield equation, the flux quantum qubit decoherence was investigated in superconducting qubit circuit affected by the mutual inductance’s influence under super-Ohm thermal reservoir environment. The results show that, firstly under the super-Ohm thermal reservoir environment, the improvement of the environmental indicator coefficient can help to extend the decoherence time of the superconducting flux qubits, thus improving the magnetic flux qubits decoherence. Secondly, building super-Ohm thermal reservoir environment can improve the solid-state qubit decoherence. Finally, the effects of the mutual inductance coupling between the inductive elements on quantum circuit system’s decoherence are more complicate, good regulation of the mutual inductance between the inductive coupling elements can help to improve the decoherence time.