The invention discloses an annular evaporator and a preparation method thereof and a refrigeration device. The annular evaporator comprises pipe fittings, first fins and second fins; the pipe fittingsform a vortex shape which extends outwards gradually from inside to outside; the first fins are provided with first through holes, the second fins are provided with second through holes, and the second fins and the first fins are arranged at intervals along the extending direction of the pipe fittings, wherein the second fins are further provided with fixing holes with openings in one sides; andthe pipe fittings are suitable for being inserted and assembled from one sides of the fixing holes, and the pipe sections penetrating through the second through holes of the second fins and the pipe sections inserted into the fixing holes of the second fins are adjacently arranged. According to the annular evaporator, the second fins with the fixing holes and the second through holes are adopted,so that the effects of edge winding and fixing can be achieved, the production efficiency of the annular evaporator is improved, and structure compactness of the annular evaporator is ensured.