The invention discloses a surface-mounted super capacitor and a preparation method thereof. The method comprises: S1, an active substance slurry is prepared; S2, high-temperature-resistant resin being resistant to the high temperature of over 260 DEG C is printed on a paper substrate in a silk-screen printing manner, the igh-temperature-resistant resin is infiltrated into the paper substrate to form a frame cofferdam, and then heating is carried out to solidify the high-temperature-resistant resin; S3, the active substance slurry obtained by the S1 is printed in the cofferdam obtained at the S2, drying is carried out after printing, and one pair of spaced electrodes is formed in the cofferdam; S4, current collectors being resistant to the high temperature of over 260 DEG C are prepared on one pair of electrodes obtained at the S3; S5, the cofferdam is filled with an electrolyte and thus the electrolyte at least fills the relative gap between the one pair of electrodes distributed in the cofferdam; and S6, device packaging is carried out to obtain a surface-mounted super capacitor. A super capacitor having a surface-mounted structure can be prepared; and the super capacitor has advantages of having low cost, being friendly to the environment, and being resistant to a reflow soldering impact.