Heliostats, as the core solar energy concentrating elements in tower solar thermal power plants, require accurate evaluation of the wind-resistance reliability to ensure safe and efficient operation of the power plants. To address this, a wind-resistance reliability evaluation method for heliostats considering the shielding effect of heliostat field is proposed. Firstly, wind tunnel pressure measurement tests were conducted on a heliostat field to obtain wind shape coefficients of the mirrors, and measure the shielding effects of the heliostat field based on its spatial variations. Subsequently, by combining random wind field simulation, finite element simulation, and probability density evolution theory, a wind-resistance reliability evaluation method for heliostats considering the shielding effects of heliostat field was established, with the mirror stress, deformation, and surface slope error as response indicators. Finally, taking a group of small heliostats in the heliostat field as an example, the influence of the shielding effects of the heliostat field, mirror pitch angle, wind direction angle and other parameters on its wind-resistance reliability was investigated. The results shows that the reliability of the helopstats on the outer side mirror of the heliostat field was significantly lower than that on the inner side. The reliability of the outer side was higher than when facing the wind compared to when facing away from it. In addition, for the heliostats on the outer side of the heliostat field, their reliability shows significant variations with changes in wind direction and pitch angle, whereas the reliability of the inner heliostats showed minimal variation with these parameters.