A waterless urinal comprising: a first installation guide member which is mounted in an installation hole of the urinal; a second installation guide member which is fastened and fixed to the first installation guide member so as to allow a urine drainage guide member to be mounted to the second installation guide member; the urine drainage guide member which is mounted in the second installation guide member so as to guide drainage of urine; a discharge guide member which is seated on a catching projection provided in the urine drainage guide member to guide drainage of urine and block a reverse flow of an offensive odor; and a urine guide member which has a urine guide rod coupled to a discharge guide surface provided on the discharge guide member so as to guide the guided drainage of urine, wherein the discharge guide member includes: a discharge guide body which is coupled to the urine guide member; a catching piece which protrudes at an upper end portion of the discharge guide body and is seated on the catching projection of the urine drainage guide member, the discharge guide surface which is opened by urine supplied to a lower end portion of the discharge guide body so as to discharge urine, and restored by its own elasticity when urine is not supplied thereto; and a guide rod coupling groove which protrudes on the discharge guide surface so as to allow the urine guide rod of the urine guide member to be coupled thereto. a first installation guide member which is mounted in an installation hole of the urinal; a second installation guide member which is fastened and fixed to the first installation guide member so as to allow a urine drainage guide member to be mounted to the second installation guide member; the urine drainage guide member which is mounted in the second installation guide member so as to guide drainage of urine; a discharge guide member which is seated on a catching projection provided in the urine drainage guide member to guide drainage of urine and block a reverse flow of an offensive odor; and a urine guide member which has a urine guide rod coupled to a discharge guide surface provided on the discharge guide member so as to guide the guided drainage of urine, wherein the discharge guide member includes: a discharge guide body which is coupled to the urine guide member; a catching piece which protrudes at an upper end portion of the discharge guide body and is seated on the catching projection of the urine drainage guide member, the discharge guide surface which is opened by urine supplied to a lower end portion of the discharge guide body so as to discharge urine, and restored by its own elasticity when urine is not supplied thereto; and a guide rod coupling groove which protrudes on the discharge guide surface so as to allow the urine guide rod of the urine guide member to be coupled thereto. a discharge guide body which is coupled to the urine guide member; a catching piece which protrudes at an upper end portion of the discharge guide body and is seated on the catching projection of the urine drainage guide member, the discharge guide surface which is opened by urine supplied to a lower end portion of the discharge guide body so as to discharge urine, and restored by its own elasticity when urine is not supplied thereto; and a guide rod coupling groove which protrudes on the discharge guide surface so as to allow the urine guide rod of the urine guide member to be coupled thereto.