The invention discloses a coiled pipe breakage prevention device for a crude oil heater. The crude oil heater comprises two collecting pipes arranged at intervals and a plurality of groups of coil pipes arranged at intervals along the two collecting pipes, the two ends of each group of coiled pipes are respectively connected with each collecting pipe at the corresponding end, and a vibration reduction connecting device used for exerting pre-thrust on the coiled pipes on two sides is arranged between every two adjacent groups of coiled pipes; and the vibration reduction connecting device comprises a pre-push rod and vibration reduction tables connected to the two ends of the pre-push rod, the pre-pushing rod drives the two vibration reduction tables to exert pre-thrust to the coil pipes onthe corresponding sides and to be connected with the coil pipes. The breakage prevention device has the advantages of being simple and reliable in structure, convenient to operate, wide in applicationrange, capable of improving overall rigidity, and capable of dissipating energy and reducing vibration.