The invention discloses a series-connection hydraulic support for tunnel floor dinting, and relates to comprehensive mining, supporting and protecting equipment for coal mine, which is used for the supporting of a nose of a tunnel floor dinting transport plane, the maintenance of a top plate at a supporting position, and the adjustment of the operating attitude of the top plate. The series-connection hydraulic support comprises a supporting frame and an anchor frame connected in series to the bottom of the supporting frame through a push-pull jack, wherein the supporting frame is integrally connected with the nose of the transport plane through a pin shaft; the inclination angle of the transport plane can be well adapted by a rotatable top beam of the supporting frame; hydraulic pressure stand columns of the supporting frame can drive the top beam to rise and fall up and down, so that the change of a height difference between the transport plane and a tunnel bottom plate can be adapted; the supporting and the protecting of a working surface top plate at the nose can be well completed by the anchor frame; a raising mechanism and a bottom adjusting mechanism which are mounted on each of two sides of a stabilizing mechanism of the anchor frame, can adjust the operating attitude of the anchor frame and the operating attitude of the adjacent support, and can improve the equipment stability of the nose; the effect of the top supporting is improved by the rotatable top beam of the anchor frame; the supporting frame as the fulcrum of the anchor frame, and the anchor frame as the fulcrum of the supporting frame move forward, so that the difficult problem of moving the nose of a hang-in-air transport plane is solved settled.