In recent years, polylactic acid（PLA）, a plant-derived polymer material, has attracted attention because it is biodegradable and environmentally friendly. However, due to its flammability and low impact resistance, the range of application of PLA is limited. In order to remedy the shortcomings while considering the environmental impact, PLA/Jute/APP composite was prepared. In the past, it has been reported that PLA and jute fiber composite achieved 90 MPa tensile strength. Ammonium polyphosphate (APP), which has a lower environmental impact than halogenated flame retardants, was used as a flame retardant. We prepared PLA/Jute40wt%/APP10wt% composite and performed a UL-94 standard combustion test. However, this composite achieved V-1 rating but failed to achieve V-0 rating. In the past, it has been reported that the composite of PLA with 30wt% cellulose (CP) and 10wt% APP reached UL-94 V-0 rating. Therefore, to improve formability and flame retardancy, we prepared PLA/Jute/CP/APP with total cellulose content of 30wt%. As a result, this composite achieved UL-94 V-0 rating. However, issues remained regarding strength. We prepared PLA/Jute/CP/APP composite and confirmed the effect of jute fiber and APP on PLA flame retardancy.