The invention discloses an oil tank capable of preventing oil stealing. The oil tank comprises an oil tank body, an oil inlet pipe is connected with the oil tank body, and an oil tank cap is arranged at an inlet end of the oil inlet pipe. The oil tank is characterized in that an outlet end of the oil inlet pipe is communicated with an oil conduit in a closed mode, the oil conduit is located in the oil tank body, an anti-skidding edge is fixedly connected with the outer wall of an outlet end of the oil conduit, the oil tank capable of preventing oil stealing further comprises a floating body, the floating body is hollow, a through hole is arranged on the top wall of the floating body, the outlet end of the oil conduit penetrates through the through hole, the anti-skidding edge is located in the floating body, the outer diameter of the anti-skidding edge is larger than the inner diameter of the through hole, an oil guiding hole is arranged on the side wall of the floating body, a sealing plug is fixedly connected with the bottom wall of the floating body, and the sealing plug corresponds to an outlet of the oil conduit. According to the oil tank, a floater is arranged, even though the oil tank cap is opened by a thief, a pipe can not be inserted into the oil tank body, stealing prevention is effectively achieved, and thereby the stealing prevention effect of the oil tank is good.