Counterweight levelness detection device and crawler crane

The utility model belongs to the technical field of engineering machinery, and particularly relates to a balance weight levelness detection device and a crawler crane, the balance weight levelness detection device comprises a balance weight base frame and a detection assembly, and the top surface of the balance weight base frame is a horizontal mounting surface for stacking balance weights; the detection assembly comprises a sealing frame with an internal sealing cavity, a detection track arranged in the internal sealing cavity, and a ball freely moving along the detection track. According to the utility model, through leftward or rightward sliding of the ball on the detection track, the levelness of the balance weight can be accurately and rapidly detected when the balance weight base frame is off the ground or not off the ground, and when the balance weight is detected to incline towards the left side and the right side, a worker can timely adjust the balance weight base frame to enable the balance weight t