The utility model relates to a high fiber content fiber reinforcement polyurethane synthetic sleeper that hard bubbles hard bubbles synthetic panel by the high fiber content fiber reinforcement polyurethane of polylith and bonds through the binder and form, and the high fiber content fiber reinforcement polyurethane of polylith hard bubbles the bonding mode of synthetic panel for vertical bonding, lateral bond or alternately bond, just the surface of sleeper is equipped with anticorrosive film. The utility model discloses an adopt the mixed type polyether glycol of the low degree of functionality of low hydroxyl value, use multiple technologies means such as coupling agent, the problem of polyurethane resin and fortifying fibre flooding insufficient is solved, thereby reinforcing fiber content has been improved, can produce density is higher than 840kgm3 and strengthens fiber content and be greater than 60% the fiber reinforcement polyurethane material goods that hard bubble, the technique that has remedied the synthetic panel of fiber reinforcement polyurethane foam is blank, make its product specification and performance pluralism, satisfy different technical indicator requirements.