The invention provides a labyrinth type oil-gas separation device in an automobile engine and belongs to the technical field of automobile engines. Technical problems existing in the prior art, such as poor oil-gas separation effect and complicated structure are solved. The oil-gas separation device comprises a labyrinth cover plate, wherein the labyrinth cover plate is fixed at the lower part of a cylinder cover and seals an opening in the lower part of the cylinder cover, the labyrinth cover plate and the cylinder cover jointly form an oil-gas separation cavity, a gas outlet communicating with the oil-gas separation cavity is formed in the upper part of the cylinder cover, a gas inlet is formed in the lower part of the labyrinth cover plate, a separating channel communicating the gas inlet and the oil-gas separation cavity is fixed at the upper part of the labyrinth cover plate, and the separating channel is long and narrow. As the separating channel in the oil-gas separation device is designed into a long and narrow one, the separating channel and the oil-gas separation cavity can form labyrinth-shaped oil and gas passing trajectories, and oil-gas separation effects can be improved.