The work aims to prepare an environmentally friendly, degradable and slow-release plant essential oil mi-crosphere. The adsorption rate of plant essential oil was used to evaluate the adsorption performance of porous starch (PS) prepared under different enzyme hydrolysis conditions. The sustained release effect of CMCS and SA concentration on the main components of thyme essential oil (TEO) was explored to determine the best preparation conditions. GC-MS was used to analyze the release rule of main components of microcapsules in a closed system at (30±1)℃ and (50±3)% RH. When the mass fractions of CMCS and SA were 1.2% and 2.4%, respectively, CMCS-SA-PS/TOE microcapsules prepared had excellent sustained release effect. In the closed system, the cumulative release rate of 14 d thymol was 19.18%. Microcapsules coated by CMCS and SA have good slow release performance and they can prolong the release time of thymol (the main component of TEO) at room temperature.