The invention discloses a primary-secondary teacup, comprising a cup cover (1) and a cup body (2), wherein the cup cover (1) is arranged on the cup body (2); and the lower part of the cup body (2) is provided with a water passing port (7) which is provided with an external-thread connecting part. The primary-secondary teacup also comprises a secondary cup body (4) connected with the cup body (2); the secondary cup body (4) is provided with a secondary water passing port (10) and a secondary cup cover (3); the secondary water passing port (10) is provided with an internal-thread connecting part matched with the external-thread connecting part of the water passing port (7); and the cup body (2) is connected with the secondary cup body (4) by the water passing port (7) and the secondary water passing port (10). The primary-secondary teacup disclosed by the invention has the advantages that not only can convenience be provided for people to drink tea in traveling and the fussy steps be reduced in drinking tea, but also the action in filtering the tea slag can be achieved, the residual tea slag is conveniently cleared and the troubles in cleaning also can be reduced.