The utility model provides an evaporimeter and freezer for freezer, the pipeline of evaporimeter is interior finned tube, sets up a plurality of inside sunken thread grooves on interior finned tube's the inner wall, and thread groove ab intra finned tube's one end terminal surface department follows extremely interior finned tube's other end terminal surface department of interior finned tube inner wall spiral, forms bellied internal thread between two arbitrary adjacent thread grooves. Is interior finned tube unit length's inner surface area 1.5 of an ordinary plain noodles copper pipe 2 doubly, it is rotatory that thread groove in the interior finned tube enables the refrigerant fluid, make in the pipeline fluid produce with radial different secondary flow, increase turbulent intensity, with the strong convection heat transfer, improved the heat exchange efficiency of evaporimeter, can the freezer energy -conserving 20 35%, the whole weight loss 10 of while freezer 25%.