The invention discloses a device for ascending and descending of a car window. The device comprises glass (3) and a drive device. The drive device comprises a bracket (4) connected with the glass (3), a first supporting block (5), a second supporting block (6), a vertical sliding block (7), a horizontal sliding block (8), an air cylinder (9) and a motor (10). A pressure sensor is arranged on the bracket (4), and a controller used for controlling the air cylinder (9) to work is arranged on the second supporting block (6). The pressure sensor is in signal connection with the controller, and the controller is in signal connection with the air cylinder (9). The device for ascending and descending of the car window is stable in glass braking work and low in production cost.