Tent having retractable roof

A tent having a retractable roof, comprising:

• a plurality of poles extending substantially perpendicular to the ground;
• a roof frame fastened to the plurality of poles;
• a tarpaulin attached on the roof frame;
• wherein at least one of the plurality of poles comprising an upper pole and a lower pole;
• a connection mechanism detachably connecting the upper pole and the lower pole, wherein the connection mechanism comprises a connection plate, a plurality of bolts and a plurality of second through holes disposed on a lower end of the upper pole, wherein a lower end of the connection plate is received in and fastened to an upper end of the lower pole, an upper end of the connection plate is received in the lower end of the upper pole, the connection plate has a plurality of first through holes, the plurality of bolts are inserted into the second through holes and the corresponding first through holes respectively so that the connection plate and the upper pole are fixedly connected, wherein said upper pole and the lower pole are formed in a shape of a hollow rectangular tube, and the connection plate formed in a shape of a beam channel;
• and
• a sleeve disposed on the lower end of the upper pole, wherein the sleeve is formed in a shape of a tube adapted to slide along the upper pole.