The invention discloses a combined type lower carrier roller comprising a support body, a first carrier roller body and two second carrier roller bodies. The support body comprises a lower cross beam,two edge supporting columns and two middle supporting columns. The edge supporting columns are symmetrically arranged at the two ends of the lower cross beam. The middle supporting columns are symmetrically arranged in the middle of the lower cross beam. The two ends of the first carrier roller body are erected on the two middle supporting columns arranged in the middle of the lower cross beam. The two second carrier roller bodies are symmetrically arranged at the two ends of the first carrier roller body. The two ends of each second carrier roller body are erected on the corresponding edge supporting column and the corresponding middle supporting column correspondingly. The combined type lower carrier roller is simple and novel in structure and has the advantages of being compact in structure, convenient to install and adjust and the like.