Machine cover hinge with adjustable angle

The utility model relates to the technical field of hinges, and discloses an angle-adjustable machine cover hinge which comprises an upper connecting plate, a first connecting rod is fixedly connected to one side of the upper connecting plate, a second connecting rod is hinged to one side of the first connecting rod, and a lower connecting plate is fixedly connected to the side, away from the first connecting rod, of the second connecting rod. Supporting rods are hinged to the lower ends of the upper connecting plates, first springs are arranged on the upper surfaces of the supporting rods, and limiting blocks are inserted into the front ends of the spring grooves. According to the angle-adjustable machine cover hinge, bolts and other connecting pieces penetrate through the positioning holes to be in threaded connection with an object needing to be connected, when the upper connecting plate is pushed upwards, the upper connecting plate can drive the supporting rod to move, and under driving of the first sprin