The invention discloses an MgB2 wire/strip heat treatment method. The method includes the steps of 1 weaving a layer of high silica glass fiber on the surface of a copper-based wire/strip and preheating an E-glass glass fiber cloth and the copper-based wire/strip; 2 rewinding a layer of an MgB2 wire/strip and the copper-based wire/strip on a reel and coating the reel with a layer of the E-glass fiber cloth; 3 repeating step 2 until the MgB2 wire/strip and the copper-based wire/strip are fully re-wound on the reel to obtain a re-wound wire/strip; 4 subjecting the re-wound wire/strip to heat treatment. By means of the MgB2 wire/strip heat treatment method, the damage to copper-based materials on the surface of MgB2 wire/strip during heat treatment due to mutual adhesion of the MgB2 wire/strip can be avoided, the repeated smoothly rewinding of the MgB2 wire/strip can be ensured after the heat treatment, the random bending of the MgB2 wire/strip due to adhesion can be avoided, and the uniformity of critical current of the MgB2 wire/strip can be improved.