The invention belongs to the technical field of oral spray, and particularly relates to an oral spray for losing weight, which comprises the following raw materials: 8-16 parts of chieh-qua, 8-16 parts of garcinia cambogia peel, 8-16 parts of gymnema sylvestre leaves, 5-15 parts of yellow cherry pepper, 5-10 parts of guarana, 4-10 parts of apios americana medikus leaves, 4-10 parts of paper mulberry leaves, 4-7 parts of red raspberry, 4-7 parts of fructus piperis longi, 3-8 parts of cleistocalyx operculatus, 3-8 parts of grifola frondosa, 3-8 parts of cornflower and 1-3 parts of menthol. After chieh-qua, garcinia cambogia peel, gymnema sylvestre leaves, yellow cherry peppers, guarana, apios americana medikus leaves, paper mulberry leaves, red raspberry, fructus piperis longi, cleistocalyx operculatus, grifola frondosa, cornflowers and menthol are combined together to form the oral spray, carbohydrates in various foods can be inhibited from being converted into fat in vivo, fat metabolism can be improved, carbohydrate metabolic balance can be adjusted, absorption of saccharides in small intestines can be inhibited, blood sugar can be stabilized, hunger sensation can be delayed, basic energy daily required by the body can be supplied and supplemented, the physical ability level can be enhanced and the health-care weight-losing effect can be comprehensively realized from multiple angles.