The invention relates to a supporting device and provides the supporting device to solve the technical problems existing in a current skid-mounted type oiling machine tank supporting device in the production process. The supporting device comprises a bottom frame formed by angle iron welding. A plurality of supporting units are symmetrically arranged on the left side and the right side of the bottom frame. Each supporting unit comprises vertical supporting plates and oblique supporting plates. The bottom ends of the vertical supporting plates and the bottom frame are welded into a whole. The top ends of the vertical supporting plates and the outer wall of a tank are welded. At least one oblique supporting plate is arranged in each supporting unit. The oblique supporting plates are obliquely arranged towards the outer wall of the tank from the inner right angle position of the bottom frame. The two ends of each oblique supporting plate are welded to the bottom frame and the outer wall of the tank. The bottom ends of the vertical supporting plates and the bottom ends of the oblique supporting plates are arranged on the same position of the bottom frame, and welded to the bottom frame into a whole. According to the supporting device, the discharging speed is increased, the material usage amount is reduced, meanwhile, a triangular support is adopted, the structure is stable, and the tank can be effectively supported.