Photovoltaic support back locking device

The utility model relates to a photovoltaic support back locking device. The photovoltaic support back locking device comprises a track and a plurality of track pressing blocks. Sliding grooves are symmetrically formed in the four long edges of the rail. A plurality of locking devices are symmetrically arranged at the ends of the two sliding grooves in the lower portion of the rail. The rail pressing blocks are arranged on the sliding grooves in the two sides of the upper portion of the rail in a sliding mode, and each rail pressing block comprises an upper pressing block, a lower pressing block and a second bolt; the upper pressing block is of a T-shaped structure; a threaded through hole is formed in the center of the upper pressing block, the lower pressing block is of a U-shaped structure matched with the upper pressing block, a second through hole is formed in the center of the lower pressing block, a second bolt penetrates through the second through hole in the lower pressing block and is in threaded co