Procurement in Kenya public institutions is characterized by resource wastage, corruption resulting to the lack of value for money. This study sought to determine the influence of lean procurement tools on the performance of procurement function in public institution a case of Agriculture and Food Authority. In specific, the study sought to determine the influence of Just in Time, E-procurement, Supplier Relationship Management and Continuous Improvement on the performance of the Procurement function. Descriptive research design was employed. The target population of the study was 8 directorates of Agriculture and Food Authority with accessible population of 450 and a sample of 82. Data was collected analyzed using SPSS. Demographic, descriptive, and inferential analysis were carried out and the findings presented in form of tables and figures. The study established that Just in Time, E-procurement, Supplier relationship Management and Continuous Improvement have a positive and significant relationship with the performance of procurement function in Agriculture and Food Authority. The study concluded that an improvement on just in time, eprocurement, supplier relationship management and continuous improvement leads to improved performance of procurement function. The study recommended for improvement zero inventories, zero lead time, e-tendering, supplier development, reduced variability among other recommendations.