The invention discloses a connecting mechanism of a vibroseis flat plate, and relates to the technical field of petroleum exploration. The connecting mechanism of the vibroseis flat plate comprises apiston rod, a piston rod seat, the vibroseis flat plate, a heat insulating unit comprising a first heat insulating sleeve and a heat insulating cover, a reinforcing plate and bolts. The vibroseis flatplate is provided with an opening. The piston rod seat is arranged in the opening of the vibroseis flat plate. The reinforcing plate is arranged on the upper portion of the vibroseis flat plate, provided with an open hole and arranged at the exterior of the piston rod seat in a sleeving mode to abut against the piston rod seat. The piston rod seat is provided with a penetrating hole. The first heat insulating sleeve is arranged in the penetrating hole. The piston rod is provided with bolt holes. The bolts are inserted in and penetrate through the first heat insulating sleeve and the bolt holes to make the piston rod be connected with the piston rod seat. The lower end of the piston rod seat is provided with a sunken part storing the head parts of the bolts. The sunken part is internally provided with the heat insulating cover. According to the connecting mechanism of the vibroseis flat plate, the possibility that snow is stuck to the bottom of the vibroseis flat plate can be reduced,and the probability that ice chunks are formed at the bottom of the flat plate is reduced.