Crocheting a square coaster with love in the middle requires some basic crocheting skills, including chain needle, single hook and double hook. The following is a possible crochet method:

1. preparation materials: some cotton thread is needed, and the color can be selected according to your preference. Of course, you need a crochet.

2. Start crocheting: First, you need to crochet a square foundation. You can crochet a small square first, then gradually expand the size until you reach the size you want.

3. Crochet love: In the center of the square, crochet a love with a single hook or a double hook. You can crochet a little love first, and then gradually expand the size until it covers the center of the whole square.

4. Finish the coaster: Once you are satisfied with the size and location of your love, you can continue to hook the edge of the square until it is completely closed.

5. Finishing: Finally, you need to cut your thread and sew it with the remaining thread to fix the shape of your coaster.

This is just a possible crochet method, and the specific crochet method may be different according to your technical level and the effect you want. If you are a beginner, you may need to look up some tutorials or ask experienced people for help.