The centroid positioning accuracy is not only one of the key factors that affect the attitude accuracy of the spaceborne laser altimeter， but also a new type of technical means for satellite platform jitter detection. Aiming at the problems that the laser spot data of geo-science laser altimeter system（GLAS） satellite platform has noise， low spatial resolution， multiple maximum energy values， etc.， which affect the centroid positioning accuracy， the feasibility of improving the spatial resolution of spaceborne laser spots in satellite platform jitter detection is mainly studied in this paper. First， a non-spot dark channel template denoising method is proposed to denoise long-sequence laser spots. Second， the collaborative deconvolution and super-resolution reconstruction methods are used to improve the “tailing” phenomenon of laser spots while increasing its spatial resolution. Finally， a gray-weighted sub-pixel centroid method for centroid tracking is proposed to track and locate the long-time laser spot to achieve the preliminary detection of the satellite platform flutter. Experimental results show that the proposed residual fitting accuracy of centroid positioning method is about 0.08 pixel higher than gray-weighted method， 0.08 pixel higher than Gaussian surface fitting method， and 0.1 pixel higher than ellipse fitting method. It is preliminarily detected that there is a 94 min attitude change rule of glas satellite platform.