Device for achieving video frame rate change

The invention discloses a device for achieving video frame rate change. The device comprises a programmable chip (1) and a small-capacity memory (2), wherein the programmable chip (1) and the small-capacity memory (2) are connected, the small-capacity memory (2) is divided into two or more frame buffers the addresses of which are different, the size of each frame buffer is the number of bytes occupied by one frame of image, and the programmable chip writes in or reads out input video images alternately in an idle frame buffer to achieve frame rate change and reads a pixel from a specific position of the frame buffer to achieve image cropping. According to the device, hardware resource cost is low, delay is slight, interframe transition of images is smooth, economical performance is high, using is easy, application range is wide, and the device can be popularized to display systems adopting low-resolution video monitors and has remarkable market prospect and economic benefits.