The work aims to study the size, concentration, and morphological structure of microparticles released from sugarcane pulp (SCP) lunchbox under different conditions including high temperature and humidity, shaking, freezing and microwave, so as to provide some references for the production and normative use of SCP lunchbox. According to the overall migration value of microparticles released by 15 kinds of commercial SCP lunchboxes in water, cluster analysis was carried out, and the size of microparticles released by different groups of lunchboxes was measured by laser diffraction particle size distribution analyzer after different working conditions during the simulated process of contact with food. The concentration and morphological structure of the released microparticles were determined by scanning electron microscope (SEM). The overall migration value of microparticles of most SCP lunchboxes in water (70 ℃ for 2 h) exceeded 10 mg/dm2, and the average size was mainly distributed between (12.19 ± 0.45) ~ (123.90 ± 28.80) μm. The size of the released microparticles after different working conditions was mainly in the range of 0 ~ 500 μm and most of microparticles were fibrous and spherical, and might be produced by shedding from the surface of the lunchboxes. The shaking conditions simulating the take-out delivery process promoted the shedding of microparticles, and showed a significant promoting effect after 270 days of high temperature and high humidity treatments (P＜0.05). The average size and the concentration of SCP lunchbox microparticles shedding in water show specific differences, and the shaking condition simulating the take-out delivery can promote the microparticles to shed from the lunchbox surface and enter the human body with dietary intake. The microparticles have certain adsorption effects on organic pollutants and metal ions, thus showing specific toxicity. Therefore, on the one hand, the toxicity of microparticles should be further studied. On the other hand, the production and normative use of SCP lunchboxes should be improved and standardized.