Environmental pollution has been determined to be the root cause of a large number of deaths and illnesses around the world. Heavy metals in wastewater have been a major problem in recent years due to their hazardous effects. Human health, living resources, and ecological systems are all at risk because of the increasing levels of hazardous metals that are being released into the environment as industrial wastes. Heavy metals in wastewater are strictly regulated by environmental organizations and authorities due to their harmful health impacts and toxicological properties. As a result, adequate safeguards must be taken, and technologies for detecting, quantifying, and removing heavy metals from effluent waterways must be developed. The most prevalent method for removing heavy metals from wastewater is adsorption. As a result of recent advances in adsorption technology, it's a potential wastewater treatment method. In recent years, the utilization of agricultural waste materials has grown in popularity. Due to their physicochemical and nontoxic properties, agricultural wastes have the potential to be employed as adsorbents. A low-cost adsorbent made from agricultural waste is one of the most common applications for agricultural waste products. This review provides an overview of applications for various agricultural waste materials added to their ability to absorb heavy metals. The different properties of agricultural waste materials are also summarized. The review article also covered the treatment procedure's effectiveness, difficulties, effects on the environment and public health, and other elements. The process parameters, the adsorption isotherm, and the adsorption kinetics are all thoroughly discussed. In this review, it has been shown that several heavy metals can be effectively removed from wastewater using inexpensive adsorbents. © 2022