A triphibian diker for the earthwork of a beach can be operated in a manner of floating on water and placing on the beach, and integrate the functions of digging, transporting and building. The triphibian diker comprises a floating body, a bracket, a truss girder, a guy cable, guide rails, cranes and grab buckets, and is characterized in that the truss girder is fixed on two floating body bracket with wheels, and the cranes with grab buckets are arranged on the guide rails on both sides of the truss girder. To solve the problem that the diker is difficult to displace on a sticky beach, an anti-vacuum suction sticky device is arranged at the bottom of the floating body. The triphibian diker has the advantages of fast soil body consolidation speed, small formed side slope, wide application range, and good using effect, and is suitable for the earthwork of various beaches such as rocky beaches, sand beaches, mud flats, high tidal flats, middle tidal flats and low tidal flats.