The invention discloses a battery car heavy load experiment device. The battery car heavy load experiment device comprises a slope experiment segment and a horizontal experiment segment. The higher end of the slope experiment segment is connected with one end of the horizontal experiment segment. The slope experiment segment and the horizontal experiment segment respectively comprise a track support. Tracks for the walking of a battery car are laid on left and right sides of the track supports. Each track support comprises a plurality of support units which are arranged in sequence. Two adjacent support units with the height higher than 0.25 m are connected through a knife fork. Each support unit comprises a cross beam. Vertical beams are respectively installed on two sides of the bottom part of the cross beam. A support seat is installed on the bottom part of the vertical beams. The tracks are installed on the cross beams. The tracks between the slope experiment segment and the horizontal experiment segment are connected. According to the invention, the practical conditions of the battery car can be simulated, heavy load detection on a battery car traction and brake system is realized, the maintenance quality of the battery car is improved, the defect of construction period delay caused by the heavy load in the program usage process is avoided, and the social benefit and the economic benefit are relatively good.