The invention discloses a water jacket for a cylinder cover. The water jacket for the cylinder cover is partitioned into an upper-layer water jacket and a lower-layer water jacket by middle partition plates, and watering holes are formed in the middle partition plates between a first cylinder exhaust channel and the front end surface of the water jacket for the cylinder cover, between the first cylinder exhaust channel and a second cylinder exhaust channel, as well as between the second cylinder exhaust channel and a third cylinder exhaust channel. According to the water jacket for the cylinder cover disclosed by the invention, by adding the first watering hole, the second watering hole and the third watering hole, the dead areas of the upper-layer water jacket in the prior art are eliminated, the cooling effects of a first cavity and a second cavity are improved, and then the cooling effects of the upper inner cavity and the lower inner cavity of the cylinder cover; compared with the prior art, a fourth watering hole and a fifth watering hole are relatively small, and the diameter of the first watering hole is sequentially increased from the front end of the cylinder cover to the rear end, thus the whole water flowing channel of cooling water is more stable and more balanced, uniform cooling for the cylinder cover is guaranteed, the cracking risk of the cylinder cover is reduced, the life of the cylinder cover is prolonged, and the quality of an engine is improved.