Monitoring device with preset adjustment function

The utility model discloses a monitoring device with a preset adjustment function. The monitoring device comprises a mounting shell and a preset adjustment unit, a fixing plate is arranged in the middle of an inner cavity of the mounting shell, a rotating cylinder is rotationally connected into a rotating hole formed in the middle of the fixing plate through a bearing, a cross-shaped sliding column is slidably connected into a cross-shaped sliding groove formed in the middle of the rotating cylinder, a rotating rod is rotationally connected into a rotating hole formed in the lower end of the cross-shaped sliding column through a bearing, and an L-shaped connecting rod is arranged at the right end of the outer cambered surface of the rotating rod; a monitoring camera is arranged on the left side of the lower end of the L-shaped connecting rod; the preset adjusting unit comprises fixing rods, external thread sliding cylinders and an adjusting frame, the fixing rods are transversely and symmetrically arranged on