Abstract: A moldboard support beam including a beam body and a wooden beam installed in the beam body. The beam body has a recessed space inward recessed from the top wall of the beam body. Two hooking members are respectively formed on the two sidewalls of the recessed space and protrude from the sidewalls into the recessed space. The wooden beam is inserted in the recessed space with two sides engaged with the hooking members so that the wooden beam cannot be extracted out of the recessed space. A wooden moldboard can be nailed on the wooden beam of the support beam. By means of the hooking members, the wooden beam can be easily fixed in the recessed space of the beam body without using any other fixing member.