A portable optical fiber welding work platform relates to the communication first-aid repairing technology field. The platform comprises a fixing plate, an overturning plate and an overturning assembly. The fixing plate is connected to the overturning plate through the overturning assembly. An outer side of the fixing plate is provided with a shoulder belt and a waistband with adjustable lengths respectively. The overturning plate is divided into a welding platform and a storage box. The storage box is provided with an opening. The opening faces towards one side of the welding platform. The overturning assembly comprises a rotating shaft, ratchet wheels, a pawl, a first shaft, a second shaft, an adjusting plate and a tension spring. The rotating shaft is fixedly arranged on the fixing plate. Two ends of the rotating shaft are fixedly installed with the ratchet wheels respectively. The pawl cooperated with the ratchet wheels is connected to the adjusting plate through the first shaft and the second shaft respectively. The adjusting plate is fixedly connected to the overturning plate. The adjusting plate is provided with a through hole accommodating the first shaft and a slideway accommodating the second shaft respectively. The second shaft can move along the slideway. The platform can be folded. The size is small, the platform can be operated by one person and application is convenient.