Downhole pipeline lifting device and lifting method

The underground pipeline lifting device comprises a conveying mechanism, two lifting mechanisms are arranged on one side of the upper surface of the conveying mechanism in parallel, a storage mechanism is further arranged at the position, corresponding to the two lifting mechanisms, of the upper surface of the conveying mechanism, and a to-be-lifted pipeline is stored in the storage mechanism; a pipeline discharging port is formed in the side, close to the lifting mechanism, of the storage mechanism, pipeline bearing mechanisms are arranged on the side, close to the pipeline discharging port, of the lifting mechanism, and the two pipeline bearing mechanisms are correspondingly arranged on the two sides of the pipeline discharging port correspondingly. According to the underground pipeline lifting device, the problems that in the prior art, the installation speed is low and the number of construction operators is large due to the fact that manual chain block or manual segmented lifting is adopted are solved. T