Laser wireless energy transmission has potential applications prospects in supplying energy for long-distance equipment. And laser wireless communication with energy transmission has important application value. For GaAs solar cell, the laser wireless communication performance of the laser energy transmission system was tested during wireless energy transmission. A wavelength of 808 nm laser to achieve the energy transmission of the GaAs solar cell was used in the experiment, and a wavelength of 650 nm laser was used as the signal transmission. The output characteristics of GaAs solar cell under three conditions of single energy transmission, single signal transmission and energy and signal simultaneous transmission were tested respectively. The results show that when the single energy is transmitted, the performance of the solar cell is closely related to the laser power density. In the range of 54.9-90 mW/cm² of the laser power density, the maximum energy conversion efficiency is 46.6%; when the single signal is transmitted, by measuring the frequency response of the system, the 3 dB bandwidth of the GaAs solar cell is about 3.7 kHz. And by designing the amplifier circuit, the communication performance of the system is improved and the output waveform is optimized, so that the transmission rate of the system is increased from 10 kbps to 240 kbps, and the output voltage peak-to-peak reaches 7.2 V. Finally, the achievable signal transmission rates under different laser intensities were measured experimentally. When the laser power density is 59.5 mW/cm², the signal transmission rate of 140 kbps is achieved, so that the laser charging system can perform signal transmission under wireless energy transmission.