The utility model discloses an automotive CNG decompressor with a balanced type valve element structure and relates to pressure reducing valve devices in gas systems of natural gas automobile engines. External threads of a valve seat (3) of the automotive CNG decompressor are connected with internal threads on the upper portion of a valve body (9) in a meshed mode. A valve rod (4) is inserted into a center hole of the valve seat (3) and a high-pressure cavity counter bore (11) in the lower middle portion of the valve body (9) in sequence from top to bottom. The lower portion of the valve body (9) is provided with a small hole (12). A plug bolt (8) presses a glass fiber filter screen (7) from bottom to top so that the glass fiber filter screen (7) can be meshed with internal threads at the bottom end of the valve body (9). A valve seat crater (31) in the shape of an inverted cone at the lower end of the valve seat (3) makes contact with a circular line on a valve element upper end face (21) of a valve element (2) so that a decompression gas inlet channel can be opened or closed in a sealed mode. An upper circular boss (41) on the upper middle portion of the valve rod (4) is sleeved with the valve element (2). A groove (42) between two circular bosses on the lower middle portion of the valve rod (4) is sleeved with an O-shaped sealing ring (5) and an O-shaped check ring (6) from top to bottom. Due to the balanced type valve element structure of a pressure reducing valve, the influence of gas inlet pressure P1 on gas outlet pressure P2 is eliminated, the pressure reducing valve is not affected by the change of pressure of an external gas cylinder, and then the pressure reducing valve is good in pressing regulating and stabilizing effect.