The invention discloses a cooling case of an engine. The cooling case comprises a case body, and the top of the case body is provided with an upper cover plate; the left top corner of the front side wall of the case body is fixedly connected with an eyebolt, and the front side wall of the case body is fixedly connected with a front side plate; the front side plate is provided with an access door,and the bottom of the case body is fixedly connected with a base; the left bottom corner of the case body is fixedly connected with left angle iron, and the right bottom corner of the case body is fixedly connected with right angle iron; the bottoms of the left angle iron and the right angle iron are each fixedly connected with a shock absorber, and the right side of the case body is connected with a connecting pipe; the lower end of the left side of the top of the case body is provided with a cooling liquid filling door, and the top of the case body is fixedly connected with an oil pump bracket; an inner cavity of the top of the case body is fixedly connected with an exhaust pipe, and the rear side wall of the case body is fixedly connected with an air hood and a water tank pulling plate;the right side plate of the case body is fixedly connected with a right side plate. According to the cooling case, the problems that lots of heat is generated in actual work of the engine and consequently a cooling device is required for cooling the engine and reducing influence of overheat on power generation of the engine are solved.