Non-excavation horizontal directional drilling machine

The utility model discloses a trenchless horizontal directional drilling machine which comprises a main machine chassis and a trenchless drilling machine body installed on the main machine chassis, and the two sides of the main machine chassis are connected with a set of crawler belt assemblies through positioning connecting mechanisms. The positioning connecting mechanism comprises a main machine beam frame, a driving motor, a first worm gear rod, a second worm gear rod, two rotating shafts, two transmission worm gears, two trapezoidal plates, two hinge plates and two hydraulic supporting legs. Compared with the prior art, the crawler assembly has the advantages that when the crawler assembly is assembled through the positioning connecting mechanisms located on the two sides of the main machine chassis, the two sets of hydraulic supporting legs stretch out first to support the main machine chassis, and then the crawler assembly is hoisted to the two sides of the main machine chassis through the foldable hois