Based on the in-depth study of the recursive construction principle， code tree structure model， mathematical theory foundation and distribution principle of orthogonal variable spreading factor （OVSF） code， a blind recognition algorithm based on fast walsh-hadamard transform for non-cooperative reception of wideband code division multiple access （WCDMA） signals is proposed. By using the inheritance relation and orthogonal property of OVSF code as well as the cyclic shift of data， and combining with the fast walsh-hadamard transform， the proposed algorithm eliminates the ambiguity of de-spreaded data and reduces the computational complexity. Theoretical analysis and experimental results show that the proposed algorithm can perform rapid de-spread and blind recognition of multiple OVSF codes in the downlink channel of the WCDMA system under the conditions of non-cooperation， no prior information and low signal-to-noise ratio， which is very reliable， effective and practical. In the actual measurement， this algorithm costs 8.2 ms to complete the recognition of at least 20 OVSF codes in three frames of data simultaneously， and the recognition accuracy is more than 95%， which has high engineering application value.