The work aims to study the effects of konjac glucomannan/nano-ZnO composite coating on banana preser-vation at room temperature, in order to provide a new way for post-harvest storage of bananas at room temperature. With Brazil bananas as experimental material, two edible coating solutions like KGM hydrosol (group A) and KGM/nano-ZnO composite hydrosol (group B) were used for coating treatment of bananas, and the non-treated bananas were considered as control (group CK). Both treated and non-treated bananas were stored at room temperature of (32±2)℃ in summer. Sampling was done every day to measure the banana's good fruit rate, browning index, weight loss rate, soluble solids content, Vc content and other indexes. The results showed that, in the whole storage period, compared with KGM coating and control group, KGM/nano-ZnO composite coating could significantly maintain the good fruit rate, inhibit the browning, reduce the weight loss rate in the storage period and decrease the loss of nutrients such as soluble solids and vitamin C of banana. The KGM/nano-ZnO composite coating solution has the best effect on the storage of post-harvest bananas at room temperature, which can maintain its high storage quality.