The palm leafhopper, <i>Haplaxius crudus</i> (Van Duzee) (Hemiptera: Cixiidae), is a vector of the pathogen that causes the lethal wilt disease in oil palm in Colombia. The development of a methodology for mass rearing of this insect is required to study its biology, behavior, population control, and to determine the causal agent of the lethal wilt disease. The experiment was carried out in Colombia, at the Research Experimental Center "Palmar de las Corocoras" of Cenipalma. The environmental conditions of the rearing unit during the study were 25.7±3.4°C, and 85±13% R. H. The mass production of <i>H. crudus</i> required the performance of five processes: 1) Planting and maintenance of <i>Panicum maximum</i> Jacq. cv. Mombasa grass, which hosts <i>H. crudus</i> nymphs, and of coconut palms (<i>Cocos nucifera</i> L.) var. dwarf yellow, to hold the adult insects; 2) Collecting nymphs in fields to create a breeding stock; 3) Infesting clumps of <i>P. maximum</i> grass with <i>H. crudus</i> eggs; 4) Maintaining the infested clumps, and 5) Trapping of emerging adults in cages. The time from the infestation of the clumps of grass, to the emergence of adults took 56.2±4.1 days. The rearing unit reached an average production of 3,145 adults per week (52.8% female and 47.2% male). The development of this rearing enables the production of enough <i>H. crudus</i> individuals to research lethal wilt, to mitigate the impact of this disease on the Colombian oil palm growing industry.