A non-welded type branch piping reinforcement apparatus for reinforcing a branch pipe system including a branch pipe joint connected to a header pipe, a connection pipe connected to the branch pipe joint, and a valve connected to the connection pipe, the non-welded type branch piping reinforcement apparatus comprising: a plurality of joint clamps arranged to cover the branch pipe joint and the connection pipe, each of the joint clamps having an arc-shaped cross section; a plurality of connection pipe clamps arranged to cover the connection pipe, each of the connection pipe clamps having an arc-shaped cross section; a plurality of valve clamps arranged to cover the connection pipe and the valve, each of the valve clamps having an arc-shaped cross section, wherein one end of each connection pipe clamp is connected to a joint clamp and the other end of each connection pipe clamp is connected to a valve clamp; a first fastening portion extending in a plate shape along each joint clamp while protruding from each of both side ends of an arc-shape of the joint clamp and provided with a first fastening hole into which a first fastening bolt is to be fitted, wherein one end of the first fastening portion is arranged to contact the header pipe while having a curved surface formed corresponding to the curvature of the header pipe; a plate-shaped first stress reinforcement plate protruding from a side surface of each joint clamp and extending along the joint clamp, wherein one end of the first stress reinforcement plate is arranged to contact the header pipe while having a curved surface formed corresponding to the curvature of the header pipe; a second fastening portion extending in a plate shape along each connection pipe clamp while protruding from each of both side ends of an arc-shape of the connection pipe clamp and provided with a second fastening hole into which a second fastening bolt is to be fitted; a plate-shaped second stress reinforcement plate protruding from a side surface of each connection pipe clamp and extending along the connection pipe clamp; a third fastening portion extending in a plate shape along each valve clamp while protruding from each of both side ends of an arc-shape of the valve clamp and provided with a third fastening hole into which a third fastening bolt is to be fitted; and a plate-shaped third stress reinforcement plate protruding from a side surface of each valve clamp and extending along the valve clamp. a plurality of joint clamps arranged to cover the branch pipe joint and the connection pipe, each of the joint clamps having an arc-shaped cross section; a plurality of connection pipe clamps arranged to cover the connection pipe, each of the connection pipe clamps having an arc-shaped cross section; a plurality of valve clamps arranged to cover the connection pipe and the valve, each of the valve clamps having an arc-shaped cross section, wherein one end of each connection pipe clamp is connected to a joint clamp and the other end of each connection pipe clamp is connected to a valve clamp; a first fastening portion extending in a plate shape along each joint clamp while protruding from each of both side ends of an arc-shape of the joint clamp and provided with a first fastening hole into which a first fastening bolt is to be fitted, wherein one end of the first fastening portion is arranged to contact the header pipe while having a curved surface formed corresponding to the curvature of the header pipe; a plate-shaped first stress reinforcement plate protruding from a side surface of each joint clamp and extending along the joint clamp, wherein one end of the first stress reinforcement plate is arranged to contact the header pipe while having a curved surface formed corresponding to the curvature of the header pipe; a second fastening portion extending in a plate shape along each connection pipe clamp while protruding from each of both side ends of an arc-shape of the connection pipe clamp and provided with a second fastening hole into which a second fastening bolt is to be fitted; a plate-shaped second stress reinforcement plate protruding from a side surface of each connection pipe clamp and extending along the connection pipe clamp; a third fastening portion extending in a plate shape along each valve clamp while protruding from each of both side ends of an arc-shape of the valve clamp and provided with a third fastening hole into which a third fastening bolt is to be fitted; and a plate-shaped third stress reinforcement plate protruding from a side surface of each valve clamp and extending along the valve clamp.