To meet the requirements of a high-gain and miniaturized receiver optical subassembly (ROSA) for radio over fiber (RoF) systems, a four-channel ROSA device with a size of 20.0mm×14.0mm×5.9mm is designed and fabricated based on hybrid integration technology. Low noise amplifier (LNA) chips are integrated into the module to improve the radio frequency (RF) signal gain, and the RF signal transmission circuit is established to simulate the performance of the device. The RF signal gain of the device is 14dB, the -3dB bandwidth of the device is 23GHz, and the responsivity of the device is 0.81A/W at the incident light wavelength of 1550nm. The crosstalk of RF signals between adjacent channels is less than -40dB. This module has important significance for reducing the volume and power consumption of the RoF system.