Shallot cultivation has constraints in regarding less fertile soil and lacking of soil nutrients. This study aimed to determine the effect of suspension extracts of the agro-industrial plant wastes (banana weevil, pineapple rhizome, and oil palm empty fruit bunches) and the type of compost (solid and liquid compost) on the soil chemical properties and the yields of shallot. The study used a Completely Randomized Block Design arranged in a factorial treatment. The first factor was the type of suspension extract of agro-industrial plant wastes, namely banana weevil (P1), pineapple rhizome (P2), and oil palm empty fruit bunches (P3). The second factor was the type of compost, namely without compost (K0), solid compost (K1), and liquid compost (K2). Data were analyzed by analysis of variance and followed by a Duncan Multiple Range Test at 5% level. The results showed that the suspension extract type of agro-industrial plant wastes and the compost type increased the pH, available-P, and organic-C of soil, but they did not affect the total-N and exchangeable-K of soil. The application suspension extract of oil palm empty fruit bunch significantly increased the volume of the bulb of shallot compared to the suspension extract of pineapple rhizome and banana weevil. Moreover, the application of compost (either solid or liquid) significantly increased the volume of the bulb of shallot compared to without compost. The application of suspension extract of oil palm empty fruit bunch with solid compost significantly increased the weight of the wet and dried bulbs compared to the suspension extracts of banana weevil and pineapple rhizomes. Also, the application of solid compost with suspension extract of oil palm empty fruit bunch significantly increased the weight of wet bulbs and dried bulbs of shallot compared to without compost and liquid compost. Therefore, the suspension extract of agro-industrial plant wastes has a potential to be used as liquid organic fertilizers.