A pipe coupler configured to connects pipes, in which a fluid with a predetermined pressure moves, while maintaining watertightness or airtightness, the pipe coupler comprising: a coupler main body having a hollow formed in a length direction thereof and configured to communicate with a pipe, wherein the pipe is insertable into a front side of the hollow; a grip ring provided in the hollow of the coupler main body and configured to fix the pipe so as to allow the pipe to be inserted thereinto and prevent the inserted pipe from coming out; and a packing member provided in the hollow of the coupler main body and made of an elastic material to seal a gap between the coupler main body and the pipe when the pipe is inserted into the packing member, wherein the packing member includes a pipe locking protrusion protruding inward from an inner surface of a lower end portion thereof for surrounding and covering a front end portion of the pipe when inserted into the packing member, characterized in that the packing member includes a first packing member and a second packing member, the first packing member having the pipe locking protrusion formed thereon and an inner surface for contacting the pipe, and the second packing member having an inner surface in contact with an outer surface of the first packing member and an outer surface in contact with the coupler main body, a packing support is provided in the hollow of the coupler main body, the packing support having a fluid passage hole formed in the center thereof so that fluid can pass therethrough and supporting a rear end portion of the second packing member so as to prevent the second packing member from moving toward a rear side of the hollow, the first packing member and the second packing member respectively include a first swash cam surface and a second swash cam surface formed to be inclined at contact surfaces thereof to correspond to each other, and thus, when the pipe is inserted into the first packing member by an external force and is caught by the pipe locking protrusion so that the first packing member is moved with the pipe toward the rear side of the hollow, the first packing member is contracted so that an inner surface thereof is pressed against the pipe and the second packing member is expanded so that an outer surface thereof is pressed against the coupler main body. a coupler main body having a hollow formed in a length direction thereof and configured to communicate with a pipe, wherein the pipe is insertable into a front side of the hollow; a grip ring provided in the hollow of the coupler main body and configured to fix the pipe so as to allow the pipe to be inserted thereinto and prevent the inserted pipe from coming out; and a packing member provided in the hollow of the coupler main body and made of an elastic material to seal a gap between the coupler main body and the pipe when the pipe is inserted into the packing member, wherein the packing member includes a pipe locking protrusion protruding inward from an inner surface of a lower end portion thereof for surrounding and covering a front end portion of the pipe when inserted into the packing member, the packing member includes a first packing member and a second packing member, the first packing member having the pipe locking protrusion formed thereon and an inner surface for contacting the pipe, and the second packing member having an inner surface in contact with an outer surface of the first packing member and an outer surface in contact with the coupler main body, a packing support is provided in the hollow of the coupler main body, the packing support having a fluid passage hole formed in the center thereof so that fluid can pass therethrough and supporting a rear end portion of the second packing member so as to prevent the second packing member from moving toward a rear side of the hollow, the first packing member and the second packing member respectively include a first swash cam surface and a second swash cam surface formed to be inclined at contact surfaces thereof to correspond to each other, and thus, when the pipe is inserted into the first packing member by an external force and is caught by the pipe locking protrusion so that the first packing member is moved with the pipe toward the rear side of the hollow, the first packing member is contracted so that an inner surface thereof is pressed against the pipe and the second packing member is expanded so that an outer surface thereof is pressed against the coupler main body.