The invention relates to the field of material conveying, in particular to a combined conveying device. The combined conveying device comprises a drive part, a clamping mechanism and a variable section guide rail, wherein one end of the drive part is fixed; an installation base is arranged at the other end of the drive part and is connected with the drive part through the clamping mechanism; the variable section guide rail is arranged in a moving direction of the installation base; a power part is arranged between the drive part and the variable section guide rail; the clamping mechanism comprises clamping plates, a pin shaft and a resetting part; the end part of the pin shaft is fixedly connected with a side wall of the installation base; a pin hole is formed in one ends of the clamping plates; the pin shaft penetrates through the clamping plates; the resetting part is arranged between the clamping plates; the clamping plates form a space for clamping the drive part; and a gap matchedwith the variable section guide rail is formed between the other ends of the clamping plates. The combined conveying device provided by the invention realizes multiple conveying modes and is capableof adjusting a conveying distance so as to achieve the technical effect on saving cost.