A self-assembly safety door comprising: a door provided on a doorpost coupled to temporary doorframes (11a, 11b) configured for being formed at tips of wall bodies so as to be opened and closed by horizontal rotation; a corner part provided on one end of the door to be coupled to the door, the corner part being coupled to the doorpost by a hinge to rotate along with the door; whereby the self-assembly safety door further comprises: a coupling part interposed between the door and the corner part to couple the door and the corner part, wherein the coupling part comprises: a fixing member provided at one of the end of the door or an adjacent end of the corner part in a longitudinal direction thereof, a slit groove formed in the other of the end of the door or the adjacent end of the corner part provided with the fixing member such that the fixing member is slidably coupled into the slit groove, a first connector for connecting one upper end of the door to one upper end of the corner part, comprising a first female connector connected to the upper end of the door, and a first male connector connected to the upper end of the corner part a second connector for connecting one lower end of the door to one lower end of the corner part, comprising a second male connector connected to the lower end of the door, and a second female connector connected to the lower end of the corner part, characterized in that the first connector comprises a first fastener to penetrate and couple the first female connector and the first male connector; and in that the second connector comprises a second fastener to penetrate and couple the second female connector and the second male connector. a door provided on a doorpost coupled to temporary doorframes (11a, 11b) configured for being formed at tips of wall bodies so as to be opened and closed by horizontal rotation; a corner part provided on one end of the door to be coupled to the door, the corner part being coupled to the doorpost by a hinge to rotate along with the door; whereby the self-assembly safety door further comprises: a coupling part interposed between the door and the corner part to couple the door and the corner part, wherein the coupling part comprises: a fixing member provided at one of the end of the door or an adjacent end of the corner part in a longitudinal direction thereof, a slit groove formed in the other of the end of the door or the adjacent end of the corner part provided with the fixing member such that the fixing member is slidably coupled into the slit groove, a first connector for connecting one upper end of the door to one upper end of the corner part, comprising a first female connector connected to the upper end of the door, and a first male connector connected to the upper end of the corner part a second connector for connecting one lower end of the door to one lower end of the corner part, comprising a second male connector connected to the lower end of the door, and a second female a coupling part interposed between the door and the corner part to couple the door and the corner part, wherein the coupling part comprises: a fixing member provided at one of the end of the door or an adjacent end of the corner part in a longitudinal direction thereof, a slit groove formed in the other of the end of the door or the adjacent end of the corner part provided with the fixing member such that the fixing member is slidably coupled into the slit groove, a first connector for connecting one upper end of the door to one upper end of the corner part, comprising a first female connector connected to the upper end of the door, and a first male connector connected to the upper end of the corner part a second connector for connecting one lower end of the door to one lower end of the corner part, comprising a second male connector connected to the lower end of the door, and a second female a fixing member provided at one of the end of the door or an adjacent end of the corner part in a longitudinal direction thereof, a slit groove formed in the other of the end of the door or the adjacent end of the corner part provided with the fixing member such that the fixing member is slidably coupled into the slit groove, a first connector for connecting one upper end of the door to one upper end of the corner part, comprising a first female connector connected to the upper end of the door, and a first male connector connected to the upper end of the corner part a second connector for connecting one lower end of the door to one lower end of the corner part, comprising a second male connector connected to the lower end of the door, and a second female connector connected to the lower end of the corner part, characterized in that the first connector comprises a first fastener to penetrate and couple the first female connector and the first male connector; and in that the second connector comprises a second fastener to penetrate and couple the second female connector and the second male connector.