The present invention relates to an auxiliary standing desk to be used by being combined with a top plate (A) of a desk for allowing a user to use the desk by standing up. According to the present invention, the auxiliary standing desk comprises: a pair of insertion members (110) detachably combined with both side ends of a top plate (A) of a desk; a pair of support frames (120) vertically combined with the insertion members; and an auxiliary top plate (130) whose both ends are supported by the support frames to be fixated horizontally. The insertion members are slidably combined forward and backward with a side end of the top plate through a round unit (111), which wraps around a side end of the top plate and a horizontal extension unit (112), which is horizontally extended from the top end of the round unit towards the top plate. On the rear end of the round unit is formed a block piece (113) which prevents the insertion members from slidably moving a certain distance or longer.
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