今天测了一下发现改错了函数，org-link-preview和org-latex-preview走的路线不一样，latex预览png透明的方案如下：
(defun my:org--make-preview-overlay (beg end image &optional imagetype)
"Build an overlay between BEG and END using IMAGE file.
Argument IMAGETYPE is the extension of the displayed image,
as a string. It defaults to \"png\"."
(let ((ov (make-overlay beg end))
(imagetype (or (intern imagetype) 'png)))
(overlay-put ov 'org-overlay-type 'org-latex-overlay)
(overlay-put ov 'evaporate t)
(overlay-put ov
'modification-hooks
(list (lambda (o _flag _beg _end &optional _l)
(delete-overlay o))))
(overlay-put ov
'display
(list 'image :type imagetype :file image :ascent 'center :mask 'heuristic))))
(advice-add 'org--make-preview-overlay :override #'my:org--make-preview-overlay)
这个要提交到org的话就简单多了 
。