The invention relates to the technical field of ultrasonic examination, in particular to an auxiliary device for ultrasonic examination, which comprises a first bed board frame, one end of the first bed board frame is movably connected with a damping rotating shaft, and one end of the first bed board frame is movably connected with a second bed board frame through the damping rotating shaft. And examination mattresses are movably connected to the interiors of the first bed board frame and the second bed board frame. Through the arrangement of the first bed board frame, the damping rotating shaft, the second bed board frame, the examination mattress, a folding strip, a T-shaped groove, a movable plate, a T-shaped block, a movable frame, an adjusting groove, a supporting bottom frame, a first spring rod and an electric push rod, medical workers are assisted in more stable whole-body ultrasonic examination work of a patient; a worker firstly lies a patient needing to be examined on the surface of the examination mattress, and then the electric push rod at the bottom of the second bed board frame is started, so that the electric push rod drives the second bed board frame to integrally perform upward lifting operation.