Wireless charging systems typically operate under variable load conditions and the power required by different loads in space varies. The power required by different loads is different in the space. At different stages of charging, the characteristics of the load may also change. WPT needs to adjust the voltage and power in real time to meet the needs of different voltages and different working conditions. The power transfer power of WPT can be optimized for variable loads. This paper introduces an active adjustable coil receiver with adaptive output power. The active adjustment of the output power is achieved by changing the different positions of the sliding rod in the receiving coil. This design allows the receiver power to remain stable in the range of 3-21 W. Receiver can meet the different power requirements of the load, and is not sensitive to factors such as transmission distance and offset. The system can reduce the complexity of charging and power supply system design, effectively promote the application of wireless power transmission in the field of multi-load equipment.