The invention discloses a transmission device of a roller skate front surface impact testing machine, wherein the testing machine can realize front surface impact testing of inline roller skates or quad roller skates through simulation. The transmission device of the invention comprises a motor and motor bearing seats; the motor and the motor bearing seats are fixed onto a rack; the front end of the motor shaft of the motor is arranged on the motor bearing seats; the motor shaft is provided with a clutch and a motor shaft belt pulley; the motor shaft belt pulley is provided with a synchronous belt; the motor shaft belt pulley is connected with a synchronous belt pulley through the synchronous belt; and the synchronous belt pulley is provided with a belt pulley main shaft. The transmission device of the invention can provide a certain pushing impact speed, so that an impact test can be efficient, stable and safe.