A telescopic plate includes a sliding rail structure (10), a rotation structure (20), a drive structure (30) including a motor (31), a circulation structure (40) including an upper connection member (41) and a lower connection member (42), and a support frame (50) mounted on the telescopic sliding rail. The sliding rail structure includes a fixed sliding rail (11) and a telescopic sliding rail (12); the rotation structure including a double-groove wheel (21) mounted at one end of the motor; the upper and lower connection members are wound on the double-groove wheel and extend into the fixed sliding rail to fix with the telescopic sliding rail; a positioning bolt (111) is provided on an inner wall at the tail end of the fixed sliding rail; a positioning groove (1211) is provided at the front end of the telescopic sliding rail; the upper and lower connection members pull the telescopic sliding rail to implement sliding of the support frame in the fixed sliding rail; the positioning bolt and the positioning groove are cooperative so that the telescopic sliding rail rotates around the positioning bolt. A motor is used for controlling to slide and rotate the support frame; a rotation angle can be adjusted by means of a remote-control operation so as to meet user requirements.