The invention relates to a method for sheathing a thermal shrink film label to a cone cup, which comprises the following steps of: printing image and text information; printing hot melt glue; manufacturing a thermal shrink film label; sheathing the thermal shrink film label; and heating the cone cup to adhere the thermal shrink film label in three stages of steam heating, wherein a steam vent at the rim of the cone cup is heated for 8-12 s at the temperature of 80-90 DEG C in the first stage of steam heating, the steam vent at the middle cup body of the cone cup is heated for 8-12 s at the temperature 70-80 DEG C and the steam vent at the bottom cup body of the cone cup is heated for 8-12 s at the temperature of 70-80 DEG C. By using the method, the thermal shrink film label is smoothly and tightly attached to the surface of the cone cup and can be fixed to the largest diameter position of the rim of the cone cup, and the thermal shrink film label can not slip off the surface of the cone cup and is especially applicable to the Styrofoam cone cup with smooth surface; by printing the image and text information on the thermal shrink film, the image and text information can be prevented from wearing, but also the surface decoration effect of the cone cup is increased.