The utility model relates to a waterproof antifreeze device for a lead-in optical cable. The waterproof antifreeze device comprises an optical cable, a nylon adapter, a sleeve steel pipe and a steel-pipe framework, wherein the optical cable is arranged in the nylon adapter and the sleeve steel pipe, the sleeve steel pipe is fixed on the steel-pipe framework, the sleeve steel pipe is partially sleeved on the nylon adapter, and a thermoplastic pipe is arranged at a connection position of upper opening of the sleeve steel pipe and the optical cable. According to the utility model, the problem of ponding caused by leading the optical cable down to a pipeline is solved, waterproof effect reaches technical requirements, and it is solved the hidden trouble that for a long time, rainwater filled into the pipeline leads to freezing of the optical cable in winter. The operational reliability of the optical cable is improved, information smoothness of the electrical network is ensured, labor, material and vehicle cost of maintenance for multiple times is saved, more economic loss due to interruption of communication cables is avoided, and considerable economic benefit is provided for safe operation of the electrical network.