Based on the least significant bit(LSB) image watermarking in spatial domain and a novel enhanced quantum representation(NEQR) quantum image representation model, a new and more secure quantum image watermarking algorithm is proposed. By dividing the carrier image into blocks, the watermarking image can be embedded more uniformly in every region of the carrier image, so the algorithm has good shearing resistance. The watermarking image is scrambled with the key before embedding the watermark, so the algorithm has good security. A quantum bit comparator is used to determine the specific location of the watermark embedded in the spatial domain of the carrier image, so the algorithm reflects better robustness. The proposed algorithm adopts a single operation method, and it has relatively low complexity and higher peak signal-to-noise ratio(PSNR). The experimental simulation is designed for the specifically embedded and extracted circuit diagram, and feasibility of the proposed algorithm is verified. Experimental results show that the proposed algorithm has a higher PSNR.