With the continuous development of communication technology and large data, many internet applications such as the large-scale network games, network payment and financial anti-counterfeiting are threatened and risked by security. In order to encrypt data in the transmission process and prevent malicious tampering, the concealment of the mainstream watermarking algorithm is studied and analysed. On the basis of robustness and robustness, a watermarking scheme of discrete wavelet transform based on pseudo-random algorithm is proposed. The algorithm embeds binary pseudo-random number into HL and LH domains of discrete wavelet transform (DWT), and uses pseudo-random number to enhance the concealment and robustness of digital watermarking. The simulation results show that the algorithm has high security and robustness, and can effectively resist various attack algorithms such as SPIHT compression, Gauss filtering, salt and pepper noise. Its peak signal-to-noise ratio (PSNR) and normalized correlation (NC) values are more than 10% higher than the traditional watermarking algorithm. The algorithm in this paper can meet the requirements of stability, reliability, strong anti-interference and high concealment of digital watermarking on the whole.