Driven by the unique polarization distribution characteristics, cylindrical vector beams play an important role in optical tweezers, high resolution imaging, remote sensing, plasma focusing, and other related fields. To realize all-fiber high-power cylindrical vector beams MOPA laser, a mode conversion fiber device based on integrated metasurface is independently designed, whose feasibility is analyzed and verified in this demonstration. The self-designed integrated metasurface mode conversion fiber device can act as a radially polarized vector beam seed with several watts, and the mode purity is more than 95%. In the experiment, a radially polarized vector beam with an output power of 52.2 W was achieved in the case of a single-stage amplifier by decreasing bending loss and controlling the mode. Moreover, the mode field distribution was maintained well during the amplification. To further analyze the obtained mode characteristics, a rotatable polarizer method was used to measure the polarization characteristics and polarization purity, and the mode purity was measured by an incoherent mode superposition method. The results show that the polarization purity of the radially polarized vector beam is approximately 95.2% and the mode purity is about 94% with the maximum output power, which verify the feasibility of the all-fiber scheme.