The invention provides a refrigeration system by utilizing tail gas of a fishing boat in the technical field of waste heat refrigeration. The refrigeration system comprises a generator, an ejector used as a compressor, a condenser, a liquid reservoir, a circulating pump, an electronic throttle valve and an evaporator, wherein the generator, the diffusion end of the ejector, the condenser, the liquid reservoir and the circulating pump are connected sequentially and form a condensing circulation part; the injection end of the ejector is sequentially connected with the outlet end of the evaporator, the electronic throttle valve and the liquid reservoir, and forms an evaporating circulation part with the condenser. According to the refrigeration system, high-temperature high-pressure working vapor generated in the generator by utilizing the waste heat is higher in injection coefficient compared with that of a single injection type device, thus having a high refrigeration coefficient; an available adsorption device with the single heat source temperature is further reduced, and the application range is enlarged; the coefficient of performance (COP) is greatly improved by applying the injection-adsorption type refrigeration system compared with that in the prior art. Due to the simple structure and few components, for the refrigeration system products are convenient to maintain and repair, and potential safety hazards of an ammonia refrigeration system do not exist.