The invention relates to the field of catalysts, and discloses an SAPO-11 molecular sieve and a hydroisomerization catalyst, and preparation methods thereof. The preparation method of the SAPO-11 molecular sieve comprises the following steps: (1) mixing a phosphorus source, an aluminum source, a silicon source, a surfactant and a template in the presence of a solvent and an acidic peptizing agentto prepare a precursor gel; and (2) carrying out a crystallization reaction on the precursor gel, and sequentially washing, drying and calcining the obtained reaction product. The hydroisomerization catalyst containing the SAPO-11 molecular sieve has an obviously high catalysis activity, and the preparation method of the catalyst is simple.