Tesla coil is a kind of highvoltage demonstration instrument widely used in education, scientific research and other fields. In order to improve its security and efficiency, an improved edition of the traditional Tesla coil is given based on modern power electronic technology. Apart from its basic scientific principles being reserved, the spark gap and high voltage DC power supply are replaced, its control loop is closely designed and three main circuits of logic processing, interrupt control, power inverter are added. Simulation and testing of the new edition proves that the proposed scheme can greatly lower the noise, lengthen the life and improves the efficiency compared with the traditional one. Added with the improvement in security and reliability, the expected results are achieved.