An apparatus for cultivating plants comprising: a cabinet forming a space where plants are cultivated; a door connected to the cabinet and opening/closing the space; a bed disposed in a space of the cabinet and supporting a seed package accommodating a medium including seeds; and a light assembly for radiating light to the seed package on the bed, wherein the light assembly includes: an LED module composed of a plurality of LED groups; a light case covering the upper portion of the LED module; and a light cover combined with the light case and supporting the lower portion of the LED module, characterized in that the apparatus further comprises introduction/withdrawal guides which are disposed on both side surfaces of the cabinet and configured to guide sliding-in/out movements of the bed, wherein the light case comprises a first set of case restricting holes and a second set of case restricting holes which are formed on the top surface of the light case, the positions of the first and second sets of the case restricting holes being different from each other, and wherein the light assembly can be selectively mounted on an inner upper plate in the cabinet using the first set of case restricting holes and light mounting members, or on the introduction/withdrawal guides using the second set of case restricting holes and light mounting members. a cabinet forming a space where plants are cultivated; a door connected to the cabinet and opening/closing the space; a bed disposed in a space of the cabinet and supporting a seed package accommodating a medium including seeds; and a light assembly for radiating light to the seed package on the bed, wherein the light assembly includes: an LED module composed of a plurality of LED groups; a light case covering the upper portion of the LED module; and a light cover combined with the light case and supporting the lower portion of the LED module, characterized in that the apparatus further comprises introduction/withdrawal guides which are disposed on both side surfaces of the cabinet and configured to guide sliding-in/out movements of the bed, wherein the light case comprises a first set of case restricting holes and a second set of case restricting holes which are formed on the top surface of the light case, the positions of the first and second sets of the case restricting holes being different from each other, and wherein the light assembly can be selectively mounted on an inner upper plate in the cabinet using the first set of case restricting holes and light mounting members, or on the introduction/withdrawal guides using the second set of case restricting holes and light mounting members. an LED module composed of a plurality of LED groups; a light case covering the upper portion of the LED module; and a light cover combined with the light case and supporting the lower portion of the LED module, characterized in that the apparatus further comprises introduction/withdrawal guides which are disposed on both side surfaces of the cabinet and configured to guide sliding-in/out movements of the bed, wherein the light case comprises a first set of case restricting holes and a second set of case restricting holes which are formed on the top surface of the light case, the positions of the first and second sets of the case restricting holes being different from each other, and wherein the light assembly can be selectively mounted on an inner upper plate in the cabinet using the first set of case restricting holes and light mounting members, or on the introduction/withdrawal guides using the second set of case restricting holes and light mounting members.