The invention discloses a cylindrical gear and a production method thereof. The device and the method belong to the technical field of powder metallurgy. The problems of low production efficiency, short service life and low smoothness of the cylindrical gear in the prior art are solved. The cylindrical gear comprises a body, a plurality of trapezoidal convex tooth seats which are uniformly distributed along the periphery of the body and a penetration structure arranged inside the body, wherein trapezoidal convex teeth are arranged on the surfaces of the trapezoidal convex tooth seats; a grooveused for placing the penetration structure is formed in the side wall of the inside of the body; the penetration structure comprises an extrusion tooth with an end surface being in contact with the bottom of the groove and a receiving body arranged on the inner side of the extrusion tooth. Through the cylindrical gear and the production method thereof, the production of the cylindrical gear is mechanized; the production efficiency is improved; the accuracy of parts is ensured; through application of the penetration structure, the lubricity of the cylindrical gear is ensured; meanwhile, through application of aerogel, the lubrication oil can be conveniently stored; the aerogel is capable of effectively absorbing heat generated by the gear in the running process, so that the service life ofthe gear is prolonged.