The cup for making tea on the go is a cup and a pack comprising a lid, a refillable teabag, tab for lifting out the bag and an attachment system, that may be secured to the lid or be incorporated in the string, said attachment preventing the bag from falling into the beverage once the tea has been prepared and having a negative effect on the taste and properties thereof, and said pack may also include a spoon and a serving of sugar. The whole pack is provided in a sealed bag that guarantees hygiene and preserves the properties of the tea, so that it does not go stale. The main advantage of said cup is that it also serves as a teapot, so that there is no need to wait in the establishment that supplies the tea, waiting for the beverage to be prepared.