The invention relates to the field of medical instrument equipment, in particular to an oral cavity lighting lamp for a stomatology department. The lamp comprises a base, three sets of walking wheelsare rotatably connected to the bottom of the base in the circumferential direction, a vertical rod is connected to the center of the top of the base, the outer wall of the vertical rod is sleeved witha sleeve, a seat post clamp is arranged on the inner wall of the sleeve, a post clamp body of the seat post clamp is in contact with the vertical rod, a wrench of the seat post clamp extends to the outer wall of the sleeve, the side wall of the sleeve is connected with a transverse rod, a sliding rail is arranged at the bottom of the transverse rod, a sliding block is in sliding clamped connection to an inner cavity of the sliding rail, a rotating disc is arranged at the bottom of the sliding block, two sets of fixing parts are symmetrically arranged at the bottom of the rotating disc in thecircumferential direction, the opposite side walls of the two sets of fixing parts are fixedly connected with a transverse shaft, an insertion part is inserted to the centre of the transverse shaft in the radial direction, the bottom of the insertion part is fixedly connected with a supporting rod, and the bottom of the supporting rod is connected with a lighting device through a connecting part.The defects that in the prior art, the angle of an oral cavity lighting lamp is inconvenient to adjust, and the function is single are effectively overcome.